/src/libxslt/libxslt/xslt.c

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/*
 * xslt.c: Implemetation of an XSL Transformation 1.0 engine
 *
 * Reference:
 *   XSLT specification
 *   http://www.w3.org/TR/1999/REC-xslt-19991116
 *
 *   Associating Style Sheets with XML documents
 *   http://www.w3.org/1999/06/REC-xml-stylesheet-19990629
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

#define IN_LIBXSLT
#include "libxslt.h"

#include <string.h>

#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/valid.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#include <libxml/xpathInternals.h>
#include <libxml/xpath.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "pattern.h"
#include "variables.h"
#include "namespaces.h"
#include "attributes.h"
#include "xsltutils.h"
#include "imports.h"
#include "keys.h"
#include "documents.h"
#include "extensions.h"
#include "preproc.h"
#include "extra.h"
#include "security.h"
#include "xsltlocale.h"

#ifdef WITH_XSLT_DEBUG
#define WITH_XSLT_DEBUG_PARSING
/* #define WITH_XSLT_DEBUG_BLANKS */
#endif

const char *xsltEngineVersion = LIBXSLT_VERSION_STRING LIBXSLT_VERSION_EXTRA;
const int xsltLibxsltVersion = LIBXSLT_VERSION;
const int xsltLibxmlVersion = LIBXML_VERSION;

#ifdef XSLT_REFACTORED

const xmlChar *xsltConstNamespaceNameXSLT = (const xmlChar *) XSLT_NAMESPACE;

#define XSLT_ELEMENT_CATEGORY_XSLT 0
#define XSLT_ELEMENT_CATEGORY_EXTENSION 1
#define XSLT_ELEMENT_CATEGORY_LRE 2

/*
* xsltLiteralResultMarker:
* Marker for Literal result elements, in order to avoid multiple attempts
* to recognize such elements in the stylesheet's tree.
* This marker is set on node->psvi during the initial traversal
* of a stylesheet's node tree.
*
const xmlChar *xsltLiteralResultMarker =
    (const xmlChar *) "Literal Result Element";
*/

/*
* xsltXSLTTextMarker:
* Marker for xsl:text elements. Used to recognize xsl:text elements
* for post-processing of the stylesheet's tree, where those
* elements are removed from the tree.
*/
const xmlChar *xsltXSLTTextMarker = (const xmlChar *) "XSLT Text Element";

/*
* xsltXSLTAttrMarker:
* Marker for XSLT attribute on Literal Result Elements.
*/
const xmlChar *xsltXSLTAttrMarker = (const xmlChar *) "LRE XSLT Attr";

#endif

#ifdef XSLT_LOCALE_WINAPI
extern xmlRMutexPtr xsltLocaleMutex;
#endif

/*
 * Useful macros
 */

#ifdef  IS_BLANK
#undef  IS_BLANK
#endif
#define IS_BLANK(c) (((c) == 0x20) || ((c) == 0x09) || ((c) == 0xA) || \
                     ((c) == 0x0D))

#ifdef  IS_BLANK_NODE
#undef  IS_BLANK_NODE
#endif
#define IS_BLANK_NODE(n)            \
    (((n)->type == XML_TEXT_NODE) && (xsltIsBlank((n)->content)))

/**
 * xsltParseContentError:
 *
 * @style: the stylesheet
 * @node: the node where the error occured
 *
 * Compile-time error function.
 */
static void
xsltParseContentError(xsltStylesheetPtr style,
           xmlNodePtr node)
{
    if ((style == NULL) || (node == NULL))
  return;

    if (IS_XSLT_ELEM(node))
  xsltTransformError(NULL, style, node,
      "The XSLT-element '%s' is not allowed at this position.\n",
      node->name);
    else
  xsltTransformError(NULL, style, node,
      "The element '%s' is not allowed at this position.\n",
      node->name);
    style->errors++;
}

#ifdef XSLT_REFACTORED
#else
/**
 * exclPrefixPush:
 * @style: the transformation stylesheet
 * @value:  the excluded namespace name to push on the stack
 *
 * Push an excluded namespace name on the stack
 *
 * Returns the new index in the stack or -1 if already present or
 * in case of error
 */
static int
exclPrefixPush(xsltStylesheetPtr style, xmlChar * value)
{
    int i;

    if (style->exclPrefixMax == 0) {
        style->exclPrefixMax = 4;
        style->exclPrefixTab =
            (xmlChar * *)xmlMalloc(style->exclPrefixMax *
                                   sizeof(style->exclPrefixTab[0]));
        if (style->exclPrefixTab == NULL) {
            xmlGenericError(xmlGenericErrorContext, "malloc failed !\n");
            return (-1);
        }
    }
    /* do not push duplicates */
    for (i = 0;i < style->exclPrefixNr;i++) {
        if (xmlStrEqual(style->exclPrefixTab[i], value))
      return(-1);
    }
    if (style->exclPrefixNr >= style->exclPrefixMax) {
        style->exclPrefixMax *= 2;
        style->exclPrefixTab =
            (xmlChar * *)xmlRealloc(style->exclPrefixTab,
                                    style->exclPrefixMax *
                                    sizeof(style->exclPrefixTab[0]));
        if (style->exclPrefixTab == NULL) {
            xmlGenericError(xmlGenericErrorContext, "realloc failed !\n");
            return (-1);
        }
    }
    style->exclPrefixTab[style->exclPrefixNr] = value;
    style->exclPrefix = value;
    return (style->exclPrefixNr++);
}
/**
 * exclPrefixPop:
 * @style: the transformation stylesheet
 *
 * Pop an excluded prefix value from the stack
 *
 * Returns the stored excluded prefix value
 */
static xmlChar *
exclPrefixPop(xsltStylesheetPtr style)
{
    xmlChar *ret;

    if (style->exclPrefixNr <= 0)
        return (0);
    style->exclPrefixNr--;
    if (style->exclPrefixNr > 0)
        style->exclPrefix = style->exclPrefixTab[style->exclPrefixNr - 1];
    else
        style->exclPrefix = NULL;
    ret = style->exclPrefixTab[style->exclPrefixNr];
    style->exclPrefixTab[style->exclPrefixNr] = 0;
    return (ret);
}
#endif

/************************************************************************
 *                  *
 *      Helper functions        *
 *                  *
 ************************************************************************/

static int initialized = 0;
/**
 * xsltInit:
 *
 * Initializes the processor (e.g. registers built-in extensions,
 * etc.)
 */
void
xsltInit (void) {
    if (initialized == 0) {
  initialized = 1;
#ifdef XSLT_LOCALE_WINAPI
  xsltLocaleMutex = xmlNewRMutex();
#endif
        xsltRegisterAllExtras();
    }
}

/**
 * xsltUninit:
 *
 * Uninitializes the processor.
 */
void
xsltUninit (void) {
#ifdef XSLT_LOCALE_WINAPI
    xmlFreeRMutex(xsltLocaleMutex);
    xsltLocaleMutex = NULL;
#endif
    initialized = 0;
}

/**
 * xsltIsBlank:
 * @str:  a string
 *
 * Check if a string is ignorable
 *
 * Returns 1 if the string is NULL or made of blanks chars, 0 otherwise
 */
int
xsltIsBlank(xmlChar *str) {
    if (str == NULL)
  return(1);
    while (*str != 0) {
  if (!(IS_BLANK(*str))) return(0);
  str++;
    }
    return(1);
}

/************************************************************************
 *                  *
 *    Routines to handle XSLT data structures     *
 *                  *
 ************************************************************************/
static xsltDecimalFormatPtr
xsltNewDecimalFormat(const xmlChar *nsUri, xmlChar *name)
{
    xsltDecimalFormatPtr self;
    /* UTF-8 for 0x2030 */
    static const xmlChar permille[4] = {0xe2, 0x80, 0xb0, 0};

    self = xmlMalloc(sizeof(xsltDecimalFormat));
    if (self != NULL) {
  self->next = NULL;
        self->nsUri = nsUri;
  self->name = name;

  /* Default values */
  self->digit = xmlStrdup(BAD_CAST("#"));
  self->patternSeparator = xmlStrdup(BAD_CAST(";"));
  self->decimalPoint = xmlStrdup(BAD_CAST("."));
  self->grouping = xmlStrdup(BAD_CAST(","));
  self->percent = xmlStrdup(BAD_CAST("%"));
  self->permille = xmlStrdup(BAD_CAST(permille));
  self->zeroDigit = xmlStrdup(BAD_CAST("0"));
  self->minusSign = xmlStrdup(BAD_CAST("-"));
  self->infinity = xmlStrdup(BAD_CAST("Infinity"));
  self->noNumber = xmlStrdup(BAD_CAST("NaN"));
    }
    return self;
}

static void
xsltFreeDecimalFormat(xsltDecimalFormatPtr self)
{
    if (self != NULL) {
  if (self->digit)
      xmlFree(self->digit);
  if (self->patternSeparator)
      xmlFree(self->patternSeparator);
  if (self->decimalPoint)
      xmlFree(self->decimalPoint);
  if (self->grouping)
      xmlFree(self->grouping);
  if (self->percent)
      xmlFree(self->percent);
  if (self->permille)
      xmlFree(self->permille);
  if (self->zeroDigit)
      xmlFree(self->zeroDigit);
  if (self->minusSign)
      xmlFree(self->minusSign);
  if (self->infinity)
      xmlFree(self->infinity);
  if (self->noNumber)
      xmlFree(self->noNumber);
  if (self->name)
      xmlFree(self->name);
  xmlFree(self);
    }
}

static void
xsltFreeDecimalFormatList(xsltStylesheetPtr self)
{
    xsltDecimalFormatPtr iter;
    xsltDecimalFormatPtr tmp;

    if (self == NULL)
  return;

    iter = self->decimalFormat;
    while (iter != NULL) {
  tmp = iter->next;
  xsltFreeDecimalFormat(iter);
  iter = tmp;
    }
}

/**
 * xsltDecimalFormatGetByName:
 * @style: the XSLT stylesheet
 * @name: the decimal-format name to find
 *
 * Find decimal-format by name
 *
 * Returns the xsltDecimalFormatPtr
 */
xsltDecimalFormatPtr
xsltDecimalFormatGetByName(xsltStylesheetPtr style, xmlChar *name)
{
    xsltDecimalFormatPtr result = NULL;

    if (name == NULL)
  return style->decimalFormat;

    while (style != NULL) {
  for (result = style->decimalFormat->next;
       result != NULL;
       result = result->next) {
      if ((result->nsUri == NULL) && xmlStrEqual(name, result->name))
    return result;
  }
  style = xsltNextImport(style);
    }
    return result;
}

/**
 * xsltDecimalFormatGetByQName:
 * @style: the XSLT stylesheet
 * @nsUri: the namespace URI of the QName
 * @name: the local part of the QName
 *
 * Find decimal-format by QName
 *
 * Returns the xsltDecimalFormatPtr
 */
xsltDecimalFormatPtr
xsltDecimalFormatGetByQName(xsltStylesheetPtr style, const xmlChar *nsUri,
                            const xmlChar *name)
{
    xsltDecimalFormatPtr result = NULL;

    if (name == NULL)
  return style->decimalFormat;

    while (style != NULL) {
  for (result = style->decimalFormat->next;
       result != NULL;
       result = result->next) {
      if (xmlStrEqual(nsUri, result->nsUri) &&
                xmlStrEqual(name, result->name))
    return result;
  }
  style = xsltNextImport(style);
    }
    return result;
}


/**
 * xsltNewTemplate:
 *
 * Create a new XSLT Template
 *
 * Returns the newly allocated xsltTemplatePtr or NULL in case of error
 */
static xsltTemplatePtr
xsltNewTemplate(void) {
    xsltTemplatePtr cur;

    cur = (xsltTemplatePtr) xmlMalloc(sizeof(xsltTemplate));
    if (cur == NULL) {
  xsltTransformError(NULL, NULL, NULL,
    "xsltNewTemplate : malloc failed\n");
  return(NULL);
    }
    memset(cur, 0, sizeof(xsltTemplate));
    cur->priority = XSLT_PAT_NO_PRIORITY;
    return(cur);
}

/**
 * xsltFreeTemplate:
 * @template:  an XSLT template
 *
 * Free up the memory allocated by @template
 */
static void
xsltFreeTemplate(xsltTemplatePtr template) {
    if (template == NULL)
  return;
    if (template->match) xmlFree(template->match);
/*
*   NOTE: @name and @nameURI are put into the string dict now.
*   if (template->name) xmlFree(template->name);
*   if (template->nameURI) xmlFree(template->nameURI);
*/
/*
    if (template->mode) xmlFree(template->mode);
    if (template->modeURI) xmlFree(template->modeURI);
 */
    if (template->inheritedNs) xmlFree(template->inheritedNs);

    /* free profiling data */
    if (template->templCalledTab) xmlFree(template->templCalledTab);
    if (template->templCountTab) xmlFree(template->templCountTab);

    memset(template, -1, sizeof(xsltTemplate));
    xmlFree(template);
}

/**
 * xsltFreeTemplateList:
 * @template:  an XSLT template list
 *
 * Free up the memory allocated by all the elements of @template
 */
static void
xsltFreeTemplateList(xsltTemplatePtr template) {
    xsltTemplatePtr cur;

    while (template != NULL) {
  cur = template;
  template = template->next;
  xsltFreeTemplate(cur);
    }
}

#ifdef XSLT_REFACTORED

static void
xsltFreeNsAliasList(xsltNsAliasPtr item)
{
    xsltNsAliasPtr tmp;

    while (item) {
  tmp = item;
  item = item->next;
  xmlFree(tmp);
    }
    return;
}

#ifdef XSLT_REFACTORED_XSLT_NSCOMP
static void
xsltFreeNamespaceMap(xsltNsMapPtr item)
{
    xsltNsMapPtr tmp;

    while (item) {
  tmp = item;
  item = item->next;
  xmlFree(tmp);
    }
    return;
}

static xsltNsMapPtr
xsltNewNamespaceMapItem(xsltCompilerCtxtPtr cctxt,
      xmlDocPtr doc,
      xmlNsPtr ns,
      xmlNodePtr elem)
{
    xsltNsMapPtr ret;

    if ((cctxt == NULL) || (doc == NULL) || (ns == NULL))
  return(NULL);

    ret = (xsltNsMapPtr) xmlMalloc(sizeof(xsltNsMap));
    if (ret == NULL) {
  xsltTransformError(NULL, cctxt->style, elem,
      "Internal error: (xsltNewNamespaceMapItem) "
      "memory allocation failed.\n");
  return(NULL);
    }
    memset(ret, 0, sizeof(xsltNsMap));
    ret->doc = doc;
    ret->ns = ns;
    ret->origNsName = ns->href;
    /*
    * Store the item at current stylesheet-level.
    */
    if (cctxt->psData->nsMap != NULL)
  ret->next = cctxt->psData->nsMap;
    cctxt->psData->nsMap = ret;

    return(ret);
}
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */

/**
 * xsltCompilerVarInfoFree:
 * @cctxt: the compilation context
 *
 * Frees the list of information for vars/params.
 */
static void
xsltCompilerVarInfoFree(xsltCompilerCtxtPtr cctxt)
{
    xsltVarInfoPtr ivar = cctxt->ivars, ivartmp;

    while (ivar) {
  ivartmp = ivar;
  ivar = ivar->next;
  xmlFree(ivartmp);
    }
}

/**
 * xsltCompilerCtxtFree:
 *
 * Free an XSLT compiler context.
 */
static void
xsltCompilationCtxtFree(xsltCompilerCtxtPtr cctxt)
{
    if (cctxt == NULL)
  return;
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
  "Freeing compilation context\n");
    xsltGenericDebug(xsltGenericDebugContext,
  "### Max inodes: %d\n", cctxt->maxNodeInfos);
    xsltGenericDebug(xsltGenericDebugContext,
  "### Max LREs  : %d\n", cctxt->maxLREs);
#endif
    /*
    * Free node-infos.
    */
    if (cctxt->inodeList != NULL) {
  xsltCompilerNodeInfoPtr tmp, cur = cctxt->inodeList;
  while (cur != NULL) {
      tmp = cur;
      cur = cur->next;
      xmlFree(tmp);
  }
    }
    if (cctxt->tmpList != NULL)
  xsltPointerListFree(cctxt->tmpList);
    if (cctxt->nsAliases != NULL)
  xsltFreeNsAliasList(cctxt->nsAliases);

    if (cctxt->ivars)
  xsltCompilerVarInfoFree(cctxt);

    xmlFree(cctxt);
}

/**
 * xsltCompilerCreate:
 *
 * Creates an XSLT compiler context.
 *
 * Returns the pointer to the created xsltCompilerCtxt or
 *         NULL in case of an internal error.
 */
static xsltCompilerCtxtPtr
xsltCompilationCtxtCreate(xsltStylesheetPtr style) {
    xsltCompilerCtxtPtr ret;

    ret = (xsltCompilerCtxtPtr) xmlMalloc(sizeof(xsltCompilerCtxt));
    if (ret == NULL) {
  xsltTransformError(NULL, style, NULL,
      "xsltCompilerCreate: allocation of compiler "
      "context failed.\n");
  return(NULL);
    }
    memset(ret, 0, sizeof(xsltCompilerCtxt));

    ret->errSeverity = XSLT_ERROR_SEVERITY_ERROR;
    ret->tmpList = xsltPointerListCreate(20);
    if (ret->tmpList == NULL) {
  goto internal_err;
    }

    return(ret);

internal_err:
    xsltCompilationCtxtFree(ret);
    return(NULL);
}

static void
xsltLREEffectiveNsNodesFree(xsltEffectiveNsPtr first)
{
    xsltEffectiveNsPtr tmp;

    while (first != NULL) {
  tmp = first;
  first = first->nextInStore;
  xmlFree(tmp);
    }
}

static void
xsltFreePrincipalStylesheetData(xsltPrincipalStylesheetDataPtr data)
{
    if (data == NULL)
  return;

    if (data->inScopeNamespaces != NULL) {
  int i;
  xsltNsListContainerPtr nsi;
  xsltPointerListPtr list =
      (xsltPointerListPtr) data->inScopeNamespaces;

  for (i = 0; i < list->number; i++) {
      /*
      * REVISIT TODO: Free info of in-scope namespaces.
      */
      nsi = (xsltNsListContainerPtr) list->items[i];
      if (nsi->list != NULL)
    xmlFree(nsi->list);
      xmlFree(nsi);
  }
  xsltPointerListFree(list);
  data->inScopeNamespaces = NULL;
    }

    if (data->exclResultNamespaces != NULL) {
  int i;
  xsltPointerListPtr list = (xsltPointerListPtr)
      data->exclResultNamespaces;

  for (i = 0; i < list->number; i++)
      xsltPointerListFree((xsltPointerListPtr) list->items[i]);

  xsltPointerListFree(list);
  data->exclResultNamespaces = NULL;
    }

    if (data->extElemNamespaces != NULL) {
  xsltPointerListPtr list = (xsltPointerListPtr)
      data->extElemNamespaces;
  int i;

  for (i = 0; i < list->number; i++)
      xsltPointerListFree((xsltPointerListPtr) list->items[i]);

  xsltPointerListFree(list);
  data->extElemNamespaces = NULL;
    }
    if (data->effectiveNs) {
  xsltLREEffectiveNsNodesFree(data->effectiveNs);
  data->effectiveNs = NULL;
    }
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    xsltFreeNamespaceMap(data->nsMap);
#endif
    xmlFree(data);
}

static xsltPrincipalStylesheetDataPtr
xsltNewPrincipalStylesheetData(void)
{
    xsltPrincipalStylesheetDataPtr ret;

    ret = (xsltPrincipalStylesheetDataPtr)
  xmlMalloc(sizeof(xsltPrincipalStylesheetData));
    if (ret == NULL) {
  xsltTransformError(NULL, NULL, NULL,
      "xsltNewPrincipalStylesheetData: memory allocation failed.\n");
  return(NULL);
    }
    memset(ret, 0, sizeof(xsltPrincipalStylesheetData));

    /*
    * Global list of in-scope namespaces.
    */
    ret->inScopeNamespaces = xsltPointerListCreate(-1);
    if (ret->inScopeNamespaces == NULL)
  goto internal_err;
    /*
    * Global list of excluded result ns-decls.
    */
    ret->exclResultNamespaces = xsltPointerListCreate(-1);
    if (ret->exclResultNamespaces == NULL)
  goto internal_err;
    /*
    * Global list of extension instruction namespace names.
    */
    ret->extElemNamespaces = xsltPointerListCreate(-1);
    if (ret->extElemNamespaces == NULL)
  goto internal_err;

    return(ret);

internal_err:

    return(NULL);
}

#endif

/**
 * xsltNewStylesheetInternal:
 * @parent:  the parent stylesheet or NULL
 *
 * Create a new XSLT Stylesheet
 *
 * Returns the newly allocated xsltStylesheetPtr or NULL in case of error
 */
static xsltStylesheetPtr
xsltNewStylesheetInternal(xsltStylesheetPtr parent) {
    xsltStylesheetPtr ret = NULL;

    ret = (xsltStylesheetPtr) xmlMalloc(sizeof(xsltStylesheet));
    if (ret == NULL) {
  xsltTransformError(NULL, NULL, NULL,
    "xsltNewStylesheet : malloc failed\n");
  goto internal_err;
    }
    memset(ret, 0, sizeof(xsltStylesheet));

    ret->parent = parent;
    ret->omitXmlDeclaration = -1;
    ret->standalone = -1;
    ret->decimalFormat = xsltNewDecimalFormat(NULL, NULL);
    ret->indent = -1;
    ret->errors = 0;
    ret->warnings = 0;
    ret->exclPrefixNr = 0;
    ret->exclPrefixMax = 0;
    ret->exclPrefixTab = NULL;
    ret->extInfos = NULL;
    ret->extrasNr = 0;
    ret->internalized = 1;
    ret->literal_result = 0;
    ret->forwards_compatible = 0;
    ret->dict = xmlDictCreate();
#ifdef WITH_XSLT_DEBUG
    xsltGenericDebug(xsltGenericDebugContext,
  "creating dictionary for stylesheet\n");
#endif

    if (parent == NULL) {
        ret->principal = ret;

        ret->xpathCtxt = xmlXPathNewContext(NULL);
        if (ret->xpathCtxt == NULL) {
            xsltTransformError(NULL, NULL, NULL,
                    "xsltNewStylesheet: xmlXPathNewContext failed\n");
            goto internal_err;
        }
        if (xmlXPathContextSetCache(ret->xpathCtxt, 1, -1, 0) == -1)
            goto internal_err;
    } else {
        ret->principal = parent->principal;
    }

    xsltInit();

    return(ret);

internal_err:
    if (ret != NULL)
  xsltFreeStylesheet(ret);
    return(NULL);
}

/**
 * xsltNewStylesheet:
 *
 * Create a new XSLT Stylesheet
 *
 * Returns the newly allocated xsltStylesheetPtr or NULL in case of error
 */
xsltStylesheetPtr
xsltNewStylesheet(void) {
    return xsltNewStylesheetInternal(NULL);
}

/**
 * xsltAllocateExtra:
 * @style:  an XSLT stylesheet
 *
 * Allocate an extra runtime information slot statically while compiling
 * the stylesheet and return its number
 *
 * Returns the number of the slot
 */
int
xsltAllocateExtra(xsltStylesheetPtr style)
{
    return(style->extrasNr++);
}

/**
 * xsltAllocateExtraCtxt:
 * @ctxt:  an XSLT transformation context
 *
 * Allocate an extra runtime information slot at run-time
 * and return its number
 * This make sure there is a slot ready in the transformation context
 *
 * Returns the number of the slot
 */
int
xsltAllocateExtraCtxt(xsltTransformContextPtr ctxt)
{
    if (ctxt->extrasNr >= ctxt->extrasMax) {
  int i;
  if (ctxt->extrasNr == 0) {
      ctxt->extrasMax = 20;
      ctxt->extras = (xsltRuntimeExtraPtr)
    xmlMalloc(ctxt->extrasMax * sizeof(xsltRuntimeExtra));
      if (ctxt->extras == NULL) {
    xsltTransformError(ctxt, NULL, NULL,
      "xsltAllocateExtraCtxt: out of memory\n");
    return(0);
      }
      for (i = 0;i < ctxt->extrasMax;i++) {
    ctxt->extras[i].info = NULL;
    ctxt->extras[i].deallocate = NULL;
    ctxt->extras[i].val.ptr = NULL;
      }

  } else {
      xsltRuntimeExtraPtr tmp;

      ctxt->extrasMax += 100;
      tmp = (xsltRuntimeExtraPtr) xmlRealloc(ctxt->extras,
                ctxt->extrasMax * sizeof(xsltRuntimeExtra));
      if (tmp == NULL) {
    xsltTransformError(ctxt, NULL, NULL,
      "xsltAllocateExtraCtxt: out of memory\n");
    return(0);
      }
      ctxt->extras = tmp;
      for (i = ctxt->extrasNr;i < ctxt->extrasMax;i++) {
    ctxt->extras[i].info = NULL;
    ctxt->extras[i].deallocate = NULL;
    ctxt->extras[i].val.ptr = NULL;
      }
  }
    }
    return(ctxt->extrasNr++);
}

/**
 * xsltFreeStylesheetList:
 * @style:  an XSLT stylesheet list
 *
 * Free up the memory allocated by the list @style
 */
static void
xsltFreeStylesheetList(xsltStylesheetPtr style) {
    xsltStylesheetPtr next;

    while (style != NULL) {
  next = style->next;
  xsltFreeStylesheet(style);
  style = next;
    }
}

/**
 * xsltCleanupStylesheetTree:
 *
 * @doc: the document-node
 * @node: the element where the stylesheet is rooted at
 *
 * Actually @node need not be the document-element, but
 * currently Libxslt does not support embedded stylesheets.
 *
 * Returns 0 if OK, -1 on API or internal errors.
 */
static int
xsltCleanupStylesheetTree(xmlDocPtr doc ATTRIBUTE_UNUSED,
        xmlNodePtr rootElem ATTRIBUTE_UNUSED)
{
#if 0 /* TODO: Currently disabled, since probably not needed. */
    xmlNodePtr cur;

    if ((doc == NULL) || (rootElem == NULL) ||
  (rootElem->type != XML_ELEMENT_NODE) ||
  (doc != rootElem->doc))
  return(-1);

    /*
    * Cleanup was suggested by Aleksey Sanin:
    * Clear the PSVI field to avoid problems if the
    * node-tree of the stylesheet is intended to be used for
    * further processing by the user (e.g. for compiling it
    * once again - although not recommended).
    */

    cur = rootElem;
    while (cur != NULL) {
  if (cur->type == XML_ELEMENT_NODE) {
      /*
      * Clear the PSVI field.
      */
      cur->psvi = NULL;
      if (cur->children) {
    cur = cur->children;
    continue;
      }
  }

leave_node:
  if (cur == rootElem)
      break;
  if (cur->next != NULL)
      cur = cur->next;
  else {
      cur = cur->parent;
      if (cur == NULL)
    break;
      goto leave_node;
  }
    }
#endif /* #if 0 */
    return(0);
}

/**
 * xsltFreeStylesheet:
 * @style:  an XSLT stylesheet
 *
 * Free up the memory allocated by @style
 */
void
xsltFreeStylesheet(xsltStylesheetPtr style)
{
    if (style == NULL)
        return;

#ifdef XSLT_REFACTORED
    /*
    * Start with a cleanup of the main stylesheet's doc.
    */
    if ((style->principal == style) && (style->doc))
  xsltCleanupStylesheetTree(style->doc,
      xmlDocGetRootElement(style->doc));
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    /*
    * Restore changed ns-decls before freeing the document.
    */
    if ((style->doc != NULL) &&
  XSLT_HAS_INTERNAL_NSMAP(style))
    {
  xsltRestoreDocumentNamespaces(XSLT_GET_INTERNAL_NSMAP(style),
      style->doc);
    }
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */
#else
    /*
    * Start with a cleanup of the main stylesheet's doc.
    */
    if ((style->parent == NULL) && (style->doc))
  xsltCleanupStylesheetTree(style->doc,
      xmlDocGetRootElement(style->doc));
#endif /* XSLT_REFACTORED */

    xsltFreeKeys(style);
    xsltFreeExts(style);
    xsltFreeTemplateHashes(style);
    xsltFreeDecimalFormatList(style);
    xsltFreeTemplateList(style->templates);
    xsltFreeAttributeSetsHashes(style);
    xsltFreeNamespaceAliasHashes(style);
    xsltFreeStylePreComps(style);
    /*
    * Free documents of all included stylsheet modules of this
    * stylesheet level.
    */
    xsltFreeStyleDocuments(style);
    /*
    * TODO: Best time to shutdown extension stuff?
    */
    xsltShutdownExts(style);

    if (style->variables != NULL)
        xsltFreeStackElemList(style->variables);
    if (style->cdataSection != NULL)
        xmlHashFree(style->cdataSection, NULL);
    if (style->stripSpaces != NULL)
        xmlHashFree(style->stripSpaces, NULL);
    if (style->nsHash != NULL)
        xmlHashFree(style->nsHash, NULL);
    if (style->exclPrefixTab != NULL)
        xmlFree(style->exclPrefixTab);
    if (style->method != NULL)
        xmlFree(style->method);
    if (style->methodURI != NULL)
        xmlFree(style->methodURI);
    if (style->version != NULL)
        xmlFree(style->version);
    if (style->encoding != NULL)
        xmlFree(style->encoding);
    if (style->doctypePublic != NULL)
        xmlFree(style->doctypePublic);
    if (style->doctypeSystem != NULL)
        xmlFree(style->doctypeSystem);
    if (style->mediaType != NULL)
        xmlFree(style->mediaType);
    if (style->attVTs)
        xsltFreeAVTList(style->attVTs);
    if (style->imports != NULL)
        xsltFreeStylesheetList(style->imports);

#ifdef XSLT_REFACTORED
    /*
    * If this is the principal stylesheet, then
    * free its internal data.
    */
    if (style->principal == style) {
  if (style->principalData) {
      xsltFreePrincipalStylesheetData(style->principalData);
      style->principalData = NULL;
  }
    }
#endif
    /*
    * Better to free the main document of this stylesheet level
    * at the end - so here.
    */
    if (style->doc != NULL) {
        xmlFreeDoc(style->doc);
    }

#ifdef WITH_XSLT_DEBUG
    xsltGenericDebug(xsltGenericDebugContext,
                     "freeing dictionary from stylesheet\n");
#endif
    xmlDictFree(style->dict);

    if (style->xpathCtxt != NULL)
  xmlXPathFreeContext(style->xpathCtxt);

    memset(style, -1, sizeof(xsltStylesheet));
    xmlFree(style);
}

/************************************************************************
 *                  *
 *    Parsing of an XSLT Stylesheet       *
 *                  *
 ************************************************************************/

#ifdef XSLT_REFACTORED
    /*
    * This is now performed in an optimized way in xsltParseXSLTTemplate.
    */
#else
/**
 * xsltGetInheritedNsList:
 * @style:  the stylesheet
 * @template: the template
 * @node:  the current node
 *
 * Search all the namespace applying to a given element except the ones
 * from excluded output prefixes currently in scope. Initialize the
 * template inheritedNs list with it.
 *
 * Returns the number of entries found
 */
static int
xsltGetInheritedNsList(xsltStylesheetPtr style,
                 xsltTemplatePtr template,
                 xmlNodePtr node)
{
    xmlNsPtr cur;
    xmlNsPtr *ret = NULL;
    int nbns = 0;
    int maxns = 10;
    int i;

    if ((style == NULL) || (template == NULL) || (node == NULL) ||
  (template->inheritedNsNr != 0) || (template->inheritedNs != NULL))
  return(0);
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE) {
            cur = node->nsDef;
            while (cur != NULL) {
    if (xmlStrEqual(cur->href, XSLT_NAMESPACE))
        goto skip_ns;

    if ((cur->prefix != NULL) &&
        (xsltCheckExtPrefix(style, cur->prefix)))
        goto skip_ns;
    /*
    * Check if this namespace was excluded.
    * Note that at this point only the exclusions defined
    * on the topmost stylesheet element are in the exclusion-list.
    */
    for (i = 0;i < style->exclPrefixNr;i++) {
        if (xmlStrEqual(cur->href, style->exclPrefixTab[i]))
      goto skip_ns;
    }
                if (ret == NULL) {
                    ret =
                        (xmlNsPtr *) xmlMalloc((maxns + 1) *
                                               sizeof(xmlNsPtr));
                    if (ret == NULL) {
                        xmlGenericError(xmlGenericErrorContext,
                                        "xsltGetInheritedNsList : out of memory!\n");
                        return(0);
                    }
                    ret[nbns] = NULL;
                }
    /*
    * Skip shadowed namespace bindings.
    */
                for (i = 0; i < nbns; i++) {
                    if ((cur->prefix == ret[i]->prefix) ||
                        (xmlStrEqual(cur->prefix, ret[i]->prefix)))
                        break;
                }
                if (i >= nbns) {
                    if (nbns >= maxns) {
                        maxns *= 2;
                        ret = (xmlNsPtr *) xmlRealloc(ret,
                                                      (maxns +
                                                       1) *
                                                      sizeof(xmlNsPtr));
                        if (ret == NULL) {
                            xmlGenericError(xmlGenericErrorContext,
                                            "xsltGetInheritedNsList : realloc failed!\n");
                            return(0);
                        }
                    }
                    ret[nbns++] = cur;
                    ret[nbns] = NULL;
                }
skip_ns:
                cur = cur->next;
            }
        }
        node = node->parent;
    }
    if (nbns != 0) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
                         "template has %d inherited namespaces\n", nbns);
#endif
  template->inheritedNsNr = nbns;
  template->inheritedNs = ret;
    }
    return (nbns);
}
#endif /* else of XSLT_REFACTORED */

/**
 * xsltParseStylesheetOutput:
 * @style:  the XSLT stylesheet
 * @cur:  the "output" element
 *
 * parse an XSLT stylesheet output element and record
 * information related to the stylesheet output
 */

void
xsltParseStylesheetOutput(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlChar *elements,
     *prop;
    xmlChar *element,
     *end;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
        return;

    prop = xmlGetNsProp(cur, (const xmlChar *) "version", NULL);
    if (prop != NULL) {
        if (style->version != NULL)
            xmlFree(style->version);
        style->version = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "encoding", NULL);
    if (prop != NULL) {
        if (style->encoding != NULL)
            xmlFree(style->encoding);
        style->encoding = prop;
    }

    /* relaxed to support xt:document
    * TODO KB: What does "relaxed to support xt:document" mean?
    */
    prop = xmlGetNsProp(cur, (const xmlChar *) "method", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

        if (style->method != NULL)
            xmlFree(style->method);
        style->method = NULL;
        if (style->methodURI != NULL)
            xmlFree(style->methodURI);
        style->methodURI = NULL;

  /*
  * TODO: Don't use xsltGetQNameURI().
  */
  URI = xsltGetQNameURI(cur, &prop);
  if (prop == NULL) {
      if (style != NULL) style->errors++;
  } else if (URI == NULL) {
            if ((xmlStrEqual(prop, (const xmlChar *) "xml")) ||
                (xmlStrEqual(prop, (const xmlChar *) "html")) ||
                (xmlStrEqual(prop, (const xmlChar *) "text"))) {
                style->method = prop;
            } else {
    xsltTransformError(NULL, style, cur,
                                 "invalid value for method: %s\n", prop);
                if (style != NULL) style->warnings++;
                xmlFree(prop);
            }
  } else {
      style->method = prop;
      style->methodURI = xmlStrdup(URI);
  }
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "doctype-system", NULL);
    if (prop != NULL) {
        if (style->doctypeSystem != NULL)
            xmlFree(style->doctypeSystem);
        style->doctypeSystem = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "doctype-public", NULL);
    if (prop != NULL) {
        if (style->doctypePublic != NULL)
            xmlFree(style->doctypePublic);
        style->doctypePublic = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "standalone", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->standalone = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->standalone = 0;
        } else {
      xsltTransformError(NULL, style, cur,
                             "invalid value for standalone: %s\n", prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "indent", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->indent = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->indent = 0;
        } else {
      xsltTransformError(NULL, style, cur,
                             "invalid value for indent: %s\n", prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "omit-xml-declaration", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->omitXmlDeclaration = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->omitXmlDeclaration = 0;
        } else {
      xsltTransformError(NULL, style, cur,
                             "invalid value for omit-xml-declaration: %s\n",
                             prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    elements = xmlGetNsProp(cur, (const xmlChar *) "cdata-section-elements",
  NULL);
    if (elements != NULL) {
        if (style->cdataSection == NULL)
            style->cdataSection = xmlHashCreate(10);
        if (style->cdataSection == NULL)
            return;

        element = elements;
        while (*element != 0) {
            while (IS_BLANK(*element))
                element++;
            if (*element == 0)
                break;
            end = element;
            while ((*end != 0) && (!IS_BLANK(*end)))
                end++;
            element = xmlStrndup(element, end - element);
            if (element) {
#ifdef WITH_XSLT_DEBUG_PARSING
                xsltGenericDebug(xsltGenericDebugContext,
                                 "add cdata section output element %s\n",
                                 element);
#endif
    if (xmlValidateQName(BAD_CAST element, 0) != 0) {
        xsltTransformError(NULL, style, cur,
      "Attribute 'cdata-section-elements': The value "
      "'%s' is not a valid QName.\n", element);
        xmlFree(element);
        style->errors++;
    } else {
        const xmlChar *URI;

        /*
        * TODO: Don't use xsltGetQNameURI().
        */
        URI = xsltGetQNameURI(cur, &element);
        if (element == NULL) {
      /*
      * TODO: We'll report additionally an error
      *  via the stylesheet's error handling.
      */
      xsltTransformError(NULL, style, cur,
          "Attribute 'cdata-section-elements': "
          "Not a valid QName.\n");
      style->errors++;
        } else {
      xmlNsPtr ns;

      /*
      * XSLT-1.0 "Each QName is expanded into an
      *  expanded-name using the namespace declarations in
      *  effect on the xsl:output element in which the QName
      *  occurs; if there is a default namespace, it is used
      *  for QNames that do not have a prefix"
      * NOTE: Fix of bug #339570.
      */
      if (URI == NULL) {
          ns = xmlSearchNs(style->doc, cur, NULL);
          if (ns != NULL)
        URI = ns->href;
      }
      xmlHashAddEntry2(style->cdataSection, element, URI,
          (void *) "cdata");
      xmlFree(element);
        }
    }
            }
            element = end;
        }
        xmlFree(elements);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "media-type", NULL);
    if (prop != NULL) {
  if (style->mediaType)
      xmlFree(style->mediaType);
  style->mediaType = prop;
    }
    if (cur->children != NULL) {
  xsltParseContentError(style, cur->children);
    }
}

/**
 * xsltParseStylesheetDecimalFormat:
 * @style:  the XSLT stylesheet
 * @cur:  the "decimal-format" element
 *
 * <!-- Category: top-level-element -->
 * <xsl:decimal-format
 *   name = qname, decimal-separator = char, grouping-separator = char,
 *   infinity = string, minus-sign = char, NaN = string, percent = char
 *   per-mille = char, zero-digit = char, digit = char,
 * pattern-separator = char />
 *
 * parse an XSLT stylesheet decimal-format element and
 * and record the formatting characteristics
 */
static void
xsltParseStylesheetDecimalFormat(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlChar *prop;
    xsltDecimalFormatPtr format;
    xsltDecimalFormatPtr iter;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
  return;

    format = style->decimalFormat;

    prop = xmlGetNsProp(cur, BAD_CAST("name"), NULL);
    if (prop != NULL) {
        const xmlChar *nsUri;

        if (xmlValidateQName(prop, 0) != 0) {
            xsltTransformError(NULL, style, cur,
                "xsl:decimal-format: Invalid QName '%s'.\n", prop);
      style->warnings++;
            xmlFree(prop);
            return;
        }
        /*
        * TODO: Don't use xsltGetQNameURI().
        */
        nsUri = xsltGetQNameURI(cur, &prop);
        if (prop == NULL) {
      style->warnings++;
            return;
        }
  format = xsltDecimalFormatGetByQName(style, nsUri, prop);
  if (format != NULL) {
      xsltTransformError(NULL, style, cur,
   "xsltParseStylestyleDecimalFormat: %s already exists\n", prop);
      style->warnings++;
            xmlFree(prop);
      return;
  }
  format = xsltNewDecimalFormat(nsUri, prop);
  if (format == NULL) {
      xsltTransformError(NULL, style, cur,
     "xsltParseStylestyleDecimalFormat: failed creating new decimal-format\n");
      style->errors++;
            xmlFree(prop);
      return;
  }
  /* Append new decimal-format structure */
  for (iter = style->decimalFormat; iter->next; iter = iter->next)
      ;
  if (iter)
      iter->next = format;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"decimal-separator", NULL);
    if (prop != NULL) {
  if (format->decimalPoint != NULL) xmlFree(format->decimalPoint);
  format->decimalPoint  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"grouping-separator", NULL);
    if (prop != NULL) {
  if (format->grouping != NULL) xmlFree(format->grouping);
  format->grouping  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"infinity", NULL);
    if (prop != NULL) {
  if (format->infinity != NULL) xmlFree(format->infinity);
  format->infinity  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"minus-sign", NULL);
    if (prop != NULL) {
  if (format->minusSign != NULL) xmlFree(format->minusSign);
  format->minusSign  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"NaN", NULL);
    if (prop != NULL) {
  if (format->noNumber != NULL) xmlFree(format->noNumber);
  format->noNumber  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"percent", NULL);
    if (prop != NULL) {
  if (format->percent != NULL) xmlFree(format->percent);
  format->percent  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"per-mille", NULL);
    if (prop != NULL) {
  if (format->permille != NULL) xmlFree(format->permille);
  format->permille  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"zero-digit", NULL);
    if (prop != NULL) {
  if (format->zeroDigit != NULL) xmlFree(format->zeroDigit);
  format->zeroDigit  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"digit", NULL);
    if (prop != NULL) {
  if (format->digit != NULL) xmlFree(format->digit);
  format->digit  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"pattern-separator", NULL);
    if (prop != NULL) {
  if (format->patternSeparator != NULL) xmlFree(format->patternSeparator);
  format->patternSeparator  = prop;
    }
    if (cur->children != NULL) {
  xsltParseContentError(style, cur->children);
    }
}

/**
 * xsltParseStylesheetPreserveSpace:
 * @style:  the XSLT stylesheet
 * @cur:  the "preserve-space" element
 *
 * parse an XSLT stylesheet preserve-space element and record
 * elements needing preserving
 */

static void
xsltParseStylesheetPreserveSpace(xsltStylesheetPtr style, xmlNodePtr cur) {
    xmlChar *elements;
    xmlChar *element, *end;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
  return;

    elements = xmlGetNsProp(cur, (const xmlChar *)"elements", NULL);
    if (elements == NULL) {
  xsltTransformError(NULL, style, cur,
      "xsltParseStylesheetPreserveSpace: missing elements attribute\n");
  if (style != NULL) style->warnings++;
  return;
    }

    if (style->stripSpaces == NULL)
  style->stripSpaces = xmlHashCreate(10);
    if (style->stripSpaces == NULL)
  return;

    element = elements;
    while (*element != 0) {
  while (IS_BLANK(*element)) element++;
  if (*element == 0)
      break;
        end = element;
  while ((*end != 0) && (!IS_BLANK(*end))) end++;
  element = xmlStrndup(element, end - element);
  if (element) {
#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
    "add preserved space element %s\n", element);
#endif
      if (xmlStrEqual(element, (const xmlChar *)"*")) {
    style->stripAll = -1;
      } else {
    const xmlChar *URI;

    /*
    * TODO: Don't use xsltGetQNameURI().
    */
                URI = xsltGetQNameURI(cur, &element);

    xmlHashAddEntry2(style->stripSpaces, element, URI,
        (xmlChar *) "preserve");
      }
      xmlFree(element);
  }
  element = end;
    }
    xmlFree(elements);
    if (cur->children != NULL) {
  xsltParseContentError(style, cur->children);
    }
}

#ifdef XSLT_REFACTORED
#else
/**
 * xsltParseStylesheetExtPrefix:
 * @style:  the XSLT stylesheet
 * @template:  the "extension-element-prefixes" prefix
 *
 * parse an XSLT stylesheet's "extension-element-prefix" attribute value
 * and register the namespaces of extension instruction.
 * SPEC "A namespace is designated as an extension namespace by using
 *   an extension-element-prefixes attribute on:
 *   1) an xsl:stylesheet element
 *   2) an xsl:extension-element-prefixes attribute on a
 *      literal result element
 *   3) an extension instruction."
 */
static void
xsltParseStylesheetExtPrefix(xsltStylesheetPtr style, xmlNodePtr cur,
           int isXsltElem) {
    xmlChar *prefixes;
    xmlChar *prefix, *end;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
  return;

    if (isXsltElem) {
  /* For xsl:stylesheet/xsl:transform. */
  prefixes = xmlGetNsProp(cur,
      (const xmlChar *)"extension-element-prefixes", NULL);
    } else {
  /* For literal result elements and extension instructions. */
  prefixes = xmlGetNsProp(cur,
      (const xmlChar *)"extension-element-prefixes", XSLT_NAMESPACE);
    }
    if (prefixes == NULL) {
  return;
    }

    prefix = prefixes;
    while (*prefix != 0) {
  while (IS_BLANK(*prefix)) prefix++;
  if (*prefix == 0)
      break;
        end = prefix;
  while ((*end != 0) && (!IS_BLANK(*end))) end++;
  prefix = xmlStrndup(prefix, end - prefix);
  if (prefix) {
      xmlNsPtr ns;

      if (xmlStrEqual(prefix, (const xmlChar *)"#default"))
    ns = xmlSearchNs(style->doc, cur, NULL);
      else
    ns = xmlSearchNs(style->doc, cur, prefix);
      if (ns == NULL) {
    xsltTransformError(NULL, style, cur,
      "xsl:extension-element-prefix : undefined namespace %s\n",
                           prefix);
    if (style != NULL) style->warnings++;
      } else {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "add extension prefix %s\n", prefix);
#endif
    xsltRegisterExtPrefix(style, prefix, ns->href);
      }
      xmlFree(prefix);
  }
  prefix = end;
    }
    xmlFree(prefixes);
}
#endif /* else of XSLT_REFACTORED */

/**
 * xsltParseStylesheetStripSpace:
 * @style:  the XSLT stylesheet
 * @cur:  the "strip-space" element
 *
 * parse an XSLT stylesheet's strip-space element and record
 * the elements needing stripping
 */

static void
xsltParseStylesheetStripSpace(xsltStylesheetPtr style, xmlNodePtr cur) {
    xmlChar *elements;
    xmlChar *element, *end;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
  return;

    elements = xmlGetNsProp(cur, (const xmlChar *)"elements", NULL);
    if (elements == NULL) {
  xsltTransformError(NULL, style, cur,
      "xsltParseStylesheetStripSpace: missing elements attribute\n");
  if (style != NULL) style->warnings++;
  return;
    }

    if (style->stripSpaces == NULL)
  style->stripSpaces = xmlHashCreate(10);
    if (style->stripSpaces == NULL)
  return;

    element = elements;
    while (*element != 0) {
  while (IS_BLANK(*element)) element++;
  if (*element == 0)
      break;
        end = element;
  while ((*end != 0) && (!IS_BLANK(*end))) end++;
  element = xmlStrndup(element, end - element);
  if (element) {
#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
    "add stripped space element %s\n", element);
#endif
      if (xmlStrEqual(element, (const xmlChar *)"*")) {
    style->stripAll = 1;
      } else {
    const xmlChar *URI;

    /*
    * TODO: Don't use xsltGetQNameURI().
    */
                URI = xsltGetQNameURI(cur, &element);

    xmlHashAddEntry2(style->stripSpaces, element, URI,
              (xmlChar *) "strip");
      }
      xmlFree(element);
  }
  element = end;
    }
    xmlFree(elements);
    if (cur->children != NULL) {
  xsltParseContentError(style, cur->children);
    }
}

#ifdef XSLT_REFACTORED
#else
/**
 * xsltParseStylesheetExcludePrefix:
 * @style:  the XSLT stylesheet
 * @cur:  the current point in the stylesheet
 *
 * parse an XSLT stylesheet exclude prefix and record
 * namespaces needing stripping
 *
 * Returns the number of Excluded prefixes added at that level
 */

static int
xsltParseStylesheetExcludePrefix(xsltStylesheetPtr style, xmlNodePtr cur,
         int isXsltElem)
{
    int nb = 0;
    xmlChar *prefixes;
    xmlChar *prefix, *end;

    if ((cur == NULL) || (style == NULL) || (cur->type != XML_ELEMENT_NODE))
  return(0);

    if (isXsltElem)
  prefixes = xmlGetNsProp(cur,
      (const xmlChar *)"exclude-result-prefixes", NULL);
    else
  prefixes = xmlGetNsProp(cur,
      (const xmlChar *)"exclude-result-prefixes", XSLT_NAMESPACE);

    if (prefixes == NULL) {
  return(0);
    }

    prefix = prefixes;
    while (*prefix != 0) {
  while (IS_BLANK(*prefix)) prefix++;
  if (*prefix == 0)
      break;
        end = prefix;
  while ((*end != 0) && (!IS_BLANK(*end))) end++;
  prefix = xmlStrndup(prefix, end - prefix);
  if (prefix) {
      xmlNsPtr ns;

      if (xmlStrEqual(prefix, (const xmlChar *)"#default"))
    ns = xmlSearchNs(style->doc, cur, NULL);
      else
    ns = xmlSearchNs(style->doc, cur, prefix);
      if (ns == NULL) {
    xsltTransformError(NULL, style, cur,
      "xsl:exclude-result-prefixes : undefined namespace %s\n",
                           prefix);
    if (style != NULL) style->warnings++;
      } else {
    if (exclPrefixPush(style, (xmlChar *) ns->href) >= 0) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
      "exclude result prefix %s\n", prefix);
#endif
        nb++;
    }
      }
      xmlFree(prefix);
  }
  prefix = end;
    }
    xmlFree(prefixes);
    return(nb);
}
#endif /* else of XSLT_REFACTORED */

#ifdef XSLT_REFACTORED

/*
* xsltTreeEnsureXMLDecl:
* @doc: the doc
*
* BIG NOTE:
*  This was copy&pasted from Libxml2's xmlTreeEnsureXMLDecl() in "tree.c".
* Ensures that there is an XML namespace declaration on the doc.
*
* Returns the XML ns-struct or NULL on API and internal errors.
*/
static xmlNsPtr
xsltTreeEnsureXMLDecl(xmlDocPtr doc)
{
    if (doc == NULL)
  return (NULL);
    if (doc->oldNs != NULL)
  return (doc->oldNs);
    {
  xmlNsPtr ns;
  ns = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
  if (ns == NULL) {
      xmlGenericError(xmlGenericErrorContext,
    "xsltTreeEnsureXMLDecl: Failed to allocate "
    "the XML namespace.\n");
      return (NULL);
  }
  memset(ns, 0, sizeof(xmlNs));
  ns->type = XML_LOCAL_NAMESPACE;
  /*
  * URGENT TODO: revisit this.
  */
#ifdef LIBXML_NAMESPACE_DICT
  if (doc->dict)
      ns->href = xmlDictLookup(doc->dict, XML_XML_NAMESPACE, -1);
  else
      ns->href = xmlStrdup(XML_XML_NAMESPACE);
#else
  ns->href = xmlStrdup(XML_XML_NAMESPACE);
#endif
  ns->prefix = xmlStrdup((const xmlChar *)"xml");
  doc->oldNs = ns;
  return (ns);
    }
}

/*
* xsltTreeAcquireStoredNs:
* @doc: the doc
* @nsName: the namespace name
* @prefix: the prefix
*
* BIG NOTE:
*  This was copy&pasted from Libxml2's xmlDOMWrapStoreNs() in "tree.c".
* Creates or reuses an xmlNs struct on doc->oldNs with
* the given prefix and namespace name.
*
* Returns the aquired ns struct or NULL in case of an API
*         or internal error.
*/
static xmlNsPtr
xsltTreeAcquireStoredNs(xmlDocPtr doc,
      const xmlChar *nsName,
      const xmlChar *prefix)
{
    xmlNsPtr ns;

    if (doc == NULL)
  return (NULL);
    if (doc->oldNs != NULL)
  ns = doc->oldNs;
    else
  ns = xsltTreeEnsureXMLDecl(doc);
    if (ns == NULL)
  return (NULL);
    if (ns->next != NULL) {
  /* Reuse. */
  ns = ns->next;
  while (ns != NULL) {
      if ((ns->prefix == NULL) != (prefix == NULL)) {
    /* NOP */
      } else if (prefix == NULL) {
    if (xmlStrEqual(ns->href, nsName))
        return (ns);
      } else {
    if ((ns->prefix[0] == prefix[0]) &&
         xmlStrEqual(ns->prefix, prefix) &&
         xmlStrEqual(ns->href, nsName))
        return (ns);

      }
      if (ns->next == NULL)
    break;
      ns = ns->next;
  }
    }
    /* Create. */
    ns->next = xmlNewNs(NULL, nsName, prefix);
    return (ns->next);
}

/**
 * xsltLREBuildEffectiveNs:
 *
 * Apply ns-aliasing on the namespace of the given @elem and
 * its attributes.
 */
static int
xsltLREBuildEffectiveNs(xsltCompilerCtxtPtr cctxt,
      xmlNodePtr elem)
{
    xmlNsPtr ns;
    xsltNsAliasPtr alias;

    if ((cctxt == NULL) || (elem == NULL))
  return(-1);
    if ((cctxt->nsAliases == NULL) || (! cctxt->hasNsAliases))
  return(0);

    alias = cctxt->nsAliases;
    while (alias != NULL) {
  if ( /* If both namespaces are NULL... */
      ( (elem->ns == NULL) &&
      ((alias->literalNs == NULL) ||
      (alias->literalNs->href == NULL)) ) ||
      /* ... or both namespace are equal */
      ( (elem->ns != NULL) &&
      (alias->literalNs != NULL) &&
      xmlStrEqual(elem->ns->href, alias->literalNs->href) ) )
  {
      if ((alias->targetNs != NULL) &&
    (alias->targetNs->href != NULL))
      {
    /*
    * Convert namespace.
    */
    if (elem->doc == alias->docOfTargetNs) {
        /*
        * This is the nice case: same docs.
        * This will eventually assign a ns-decl which
        * is shadowed, but this has no negative effect on
        * the generation of the result tree.
        */
        elem->ns = alias->targetNs;
    } else {
        /*
        * This target xmlNs originates from a different
        * stylesheet tree. Try to locate it in the
        * in-scope namespaces.
        * OPTIMIZE TODO: Use the compiler-node-info inScopeNs.
        */
        ns = xmlSearchNs(elem->doc, elem,
      alias->targetNs->prefix);
        /*
        * If no matching ns-decl found, then assign a
        * ns-decl stored in xmlDoc.
        */
        if ((ns == NULL) ||
      (! xmlStrEqual(ns->href, alias->targetNs->href)))
        {
      /*
      * BIG NOTE: The use of xsltTreeAcquireStoredNs()
      *  is not very efficient, but currently I don't
      *  see an other way of *safely* changing a node's
      *  namespace, since the xmlNs struct in
      *  alias->targetNs might come from an other
      *  stylesheet tree. So we need to anchor it in the
      *  current document, without adding it to the tree,
      *  which would otherwise change the in-scope-ns
      *  semantic of the tree.
      */
      ns = xsltTreeAcquireStoredNs(elem->doc,
          alias->targetNs->href,
          alias->targetNs->prefix);

      if (ns == NULL) {
          xsltTransformError(NULL, cctxt->style, elem,
        "Internal error in "
        "xsltLREBuildEffectiveNs(): "
        "failed to acquire a stored "
        "ns-declaration.\n");
          cctxt->style->errors++;
          return(-1);

      }
        }
        elem->ns = ns;
    }
      } else {
    /*
    * Move into or leave in the NULL namespace.
    */
    elem->ns = NULL;
      }
      break;
  }
  alias = alias->next;
    }
    /*
    * Same with attributes of literal result elements.
    */
    if (elem->properties != NULL) {
  xmlAttrPtr attr = elem->properties;

  while (attr != NULL) {
      if (attr->ns == NULL) {
    attr = attr->next;
    continue;
      }
      alias = cctxt->nsAliases;
      while (alias != NULL) {
    if ( /* If both namespaces are NULL... */
        ( (elem->ns == NULL) &&
        ((alias->literalNs == NULL) ||
        (alias->literalNs->href == NULL)) ) ||
        /* ... or both namespace are equal */
        ( (elem->ns != NULL) &&
        (alias->literalNs != NULL) &&
        xmlStrEqual(elem->ns->href, alias->literalNs->href) ) )
    {
        if ((alias->targetNs != NULL) &&
      (alias->targetNs->href != NULL))
        {
      if (elem->doc == alias->docOfTargetNs) {
          elem->ns = alias->targetNs;
      } else {
          ns = xmlSearchNs(elem->doc, elem,
        alias->targetNs->prefix);
          if ((ns == NULL) ||
        (! xmlStrEqual(ns->href, alias->targetNs->href)))
          {
        ns = xsltTreeAcquireStoredNs(elem->doc,
            alias->targetNs->href,
            alias->targetNs->prefix);

        if (ns == NULL) {
            xsltTransformError(NULL, cctxt->style, elem,
          "Internal error in "
          "xsltLREBuildEffectiveNs(): "
          "failed to acquire a stored "
          "ns-declaration.\n");
            cctxt->style->errors++;
            return(-1);

        }
          }
          elem->ns = ns;
      }
        } else {
        /*
        * Move into or leave in the NULL namespace.
      */
      elem->ns = NULL;
        }
        break;
    }
    alias = alias->next;
      }

      attr = attr->next;
  }
    }
    return(0);
}

/**
 * xsltLREBuildEffectiveNsNodes:
 *
 * Computes the effective namespaces nodes for a literal result
 * element.
 * @effectiveNs is the set of effective ns-nodes
 *  on the literal result element, which will be added to the result
 *  element if not already existing in the result tree.
 *  This means that excluded namespaces (via exclude-result-prefixes,
 *  extension-element-prefixes and the XSLT namespace) not added
 *  to the set.
 *  Namespace-aliasing was applied on the @effectiveNs.
 */
static int
xsltLREBuildEffectiveNsNodes(xsltCompilerCtxtPtr cctxt,
           xsltStyleItemLRElementInfoPtr item,
           xmlNodePtr elem,
           int isLRE)
{
    xmlNsPtr ns, tmpns;
    xsltEffectiveNsPtr effNs, lastEffNs = NULL;
    int i, j, holdByElem;
    xsltPointerListPtr extElemNs = cctxt->inode->extElemNs;
    xsltPointerListPtr exclResultNs = cctxt->inode->exclResultNs;

    if ((cctxt == NULL) || (cctxt->inode == NULL) || (elem == NULL) ||
  (item == NULL) || (item->effectiveNs != NULL))
  return(-1);

    if (item->inScopeNs == NULL)
  return(0);

    extElemNs = cctxt->inode->extElemNs;
    exclResultNs = cctxt->inode->exclResultNs;

    for (i = 0; i < item->inScopeNs->totalNumber; i++) {
  ns = item->inScopeNs->list[i];
  /*
  * Skip namespaces designated as excluded namespaces
  * -------------------------------------------------
  *
  * XSLT-20 TODO: In XSLT 2.0 we need to keep namespaces
  *  which are target namespaces of namespace-aliases
  *  regardless if designated as excluded.
  *
  * Exclude the XSLT namespace.
  */
  if (xmlStrEqual(ns->href, XSLT_NAMESPACE))
      goto skip_ns;

  /*
  * Apply namespace aliasing
  * ------------------------
  *
  * SPEC XSLT 2.0
  *  "- A namespace node whose string value is a literal namespace
  *     URI is not copied to the result tree.
  *   - A namespace node whose string value is a target namespace URI
  *     is copied to the result tree, whether or not the URI
  *     identifies an excluded namespace."
  *
  * NOTE: The ns-aliasing machanism is non-cascading.
  *  (checked with Saxon, Xalan and MSXML .NET).
  * URGENT TODO: is style->nsAliases the effective list of
  *  ns-aliases, or do we need to lookup the whole
  *  import-tree?
  * TODO: Get rid of import-tree lookup.
  */
  if (cctxt->hasNsAliases) {
      xsltNsAliasPtr alias;
      /*
      * First check for being a target namespace.
      */
      alias = cctxt->nsAliases;
      do {
    /*
    * TODO: Is xmlns="" handled already?
    */
    if ((alias->targetNs != NULL) &&
        (xmlStrEqual(alias->targetNs->href, ns->href)))
    {
        /*
        * Recognized as a target namespace; use it regardless
        * if excluded otherwise.
        */
        goto add_effective_ns;
    }
    alias = alias->next;
      } while (alias != NULL);

      alias = cctxt->nsAliases;
      do {
    /*
    * TODO: Is xmlns="" handled already?
    */
    if ((alias->literalNs != NULL) &&
        (xmlStrEqual(alias->literalNs->href, ns->href)))
    {
        /*
        * Recognized as an namespace alias; do not use it.
        */
        goto skip_ns;
    }
    alias = alias->next;
      } while (alias != NULL);
  }

  /*
  * Exclude excluded result namespaces.
  */
  if (exclResultNs) {
      for (j = 0; j < exclResultNs->number; j++)
    if (xmlStrEqual(ns->href, BAD_CAST exclResultNs->items[j]))
        goto skip_ns;
  }
  /*
  * Exclude extension-element namespaces.
  */
  if (extElemNs) {
      for (j = 0; j < extElemNs->number; j++)
    if (xmlStrEqual(ns->href, BAD_CAST extElemNs->items[j]))
        goto skip_ns;
  }

add_effective_ns:
  /*
  * OPTIMIZE TODO: This information may not be needed.
  */
  if (isLRE && (elem->nsDef != NULL)) {
      holdByElem = 0;
      tmpns = elem->nsDef;
      do {
    if (tmpns == ns) {
        holdByElem = 1;
        break;
    }
    tmpns = tmpns->next;
      } while (tmpns != NULL);
  } else
      holdByElem = 0;


  /*
  * Add the effective namespace declaration.
  */
  effNs = (xsltEffectiveNsPtr) xmlMalloc(sizeof(xsltEffectiveNs));
  if (effNs == NULL) {
      xsltTransformError(NULL, cctxt->style, elem,
    "Internal error in xsltLREBuildEffectiveNs(): "
    "failed to allocate memory.\n");
      cctxt->style->errors++;
      return(-1);
  }
  if (cctxt->psData->effectiveNs == NULL) {
      cctxt->psData->effectiveNs = effNs;
      effNs->nextInStore = NULL;
  } else {
      effNs->nextInStore = cctxt->psData->effectiveNs;
      cctxt->psData->effectiveNs = effNs;
  }

  effNs->next = NULL;
  effNs->prefix = ns->prefix;
  effNs->nsName = ns->href;
  effNs->holdByElem = holdByElem;

  if (lastEffNs == NULL)
      item->effectiveNs = effNs;
  else
      lastEffNs->next = effNs;
  lastEffNs = effNs;

skip_ns:
  {}
    }
    return(0);
}


/**
 * xsltLREInfoCreate:
 *
 * @isLRE: indicates if the given @elem is a literal result element
 *
 * Creates a new info for a literal result element.
 */
static int
xsltLREInfoCreate(xsltCompilerCtxtPtr cctxt,
      xmlNodePtr elem,
      int isLRE)
{
    xsltStyleItemLRElementInfoPtr item;

    if ((cctxt == NULL) || (cctxt->inode == NULL))
  return(-1);

    item = (xsltStyleItemLRElementInfoPtr)
  xmlMalloc(sizeof(xsltStyleItemLRElementInfo));
    if (item == NULL) {
  xsltTransformError(NULL, cctxt->style, NULL,
      "Internal error in xsltLREInfoCreate(): "
      "memory allocation failed.\n");
  cctxt->style->errors++;
  return(-1);
    }
    memset(item, 0, sizeof(xsltStyleItemLRElementInfo));
    item->type = XSLT_FUNC_LITERAL_RESULT_ELEMENT;
    /*
    * Store it in the stylesheet.
    */
    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;
    /*
    * @inScopeNs are used for execution of XPath expressions
    *  in AVTs.
    */
    item->inScopeNs = cctxt->inode->inScopeNs;

    if (elem)
  xsltLREBuildEffectiveNsNodes(cctxt, item, elem, isLRE);

    cctxt->inode->litResElemInfo = item;
    cctxt->inode->nsChanged = 0;
    cctxt->maxLREs++;
    return(0);
}

/**
 * xsltCompilerVarInfoPush:
 * @cctxt: the compilation context
 *
 * Pushes a new var/param info onto the stack.
 *
 * Returns the acquired variable info.
 */
static xsltVarInfoPtr
xsltCompilerVarInfoPush(xsltCompilerCtxtPtr cctxt,
          xmlNodePtr inst,
          const xmlChar *name,
          const xmlChar *nsName)
{
    xsltVarInfoPtr ivar;

    if ((cctxt->ivar != NULL) && (cctxt->ivar->next != NULL)) {
  ivar = cctxt->ivar->next;
    } else if ((cctxt->ivar == NULL) && (cctxt->ivars != NULL)) {
  ivar = cctxt->ivars;
    } else {
  ivar = (xsltVarInfoPtr) xmlMalloc(sizeof(xsltVarInfo));
  if (ivar == NULL) {
      xsltTransformError(NULL, cctxt->style, inst,
    "xsltParseInScopeVarPush: xmlMalloc() failed!\n");
      cctxt->style->errors++;
      return(NULL);
  }
  /* memset(retVar, 0, sizeof(xsltInScopeVar)); */
  if (cctxt->ivars == NULL) {
      cctxt->ivars = ivar;
      ivar->prev = NULL;
  } else {
      cctxt->ivar->next = ivar;
      ivar->prev = cctxt->ivar;
  }
  cctxt->ivar = ivar;
  ivar->next = NULL;
    }
    ivar->depth = cctxt->depth;
    ivar->name = name;
    ivar->nsName = nsName;
    return(ivar);
}

/**
 * xsltCompilerVarInfoPop:
 * @cctxt: the compilation context
 *
 * Pops all var/param infos from the stack, which
 * have the current depth.
 */
static void
xsltCompilerVarInfoPop(xsltCompilerCtxtPtr cctxt)
{

    while ((cctxt->ivar != NULL) &&
  (cctxt->ivar->depth > cctxt->depth))
    {
  cctxt->ivar = cctxt->ivar->prev;
    }
}

/*
* xsltCompilerNodePush:
*
* @cctxt: the compilation context
* @node: the node to be pushed (this can also be the doc-node)
*
*
*
* Returns the current node info structure or
*         NULL in case of an internal error.
*/
static xsltCompilerNodeInfoPtr
xsltCompilerNodePush(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xsltCompilerNodeInfoPtr inode, iprev;

    if ((cctxt->inode != NULL) && (cctxt->inode->next != NULL)) {
  inode = cctxt->inode->next;
    } else if ((cctxt->inode == NULL) && (cctxt->inodeList != NULL)) {
  inode = cctxt->inodeList;
    } else {
  /*
  * Create a new node-info.
  */
  inode = (xsltCompilerNodeInfoPtr)
      xmlMalloc(sizeof(xsltCompilerNodeInfo));
  if (inode == NULL) {
      xsltTransformError(NULL, cctxt->style, NULL,
    "xsltCompilerNodePush: malloc failed.\n");
      return(NULL);
  }
  memset(inode, 0, sizeof(xsltCompilerNodeInfo));
  if (cctxt->inodeList == NULL)
      cctxt->inodeList = inode;
  else {
      cctxt->inodeLast->next = inode;
      inode->prev = cctxt->inodeLast;
  }
  cctxt->inodeLast = inode;
  cctxt->maxNodeInfos++;
  if (cctxt->inode == NULL) {
      cctxt->inode = inode;
      /*
      * Create an initial literal result element info for
      * the root of the stylesheet.
      */
      xsltLREInfoCreate(cctxt, NULL, 0);
  }
    }
    cctxt->depth++;
    cctxt->inode = inode;
    /*
    * REVISIT TODO: Keep the reset always complete.
    * NOTE: Be carefull with the @node, since it might be
    *  a doc-node.
    */
    inode->node = node;
    inode->depth = cctxt->depth;
    inode->templ = NULL;
    inode->category = XSLT_ELEMENT_CATEGORY_XSLT;
    inode->type = 0;
    inode->item = NULL;
    inode->curChildType = 0;
    inode->extContentHandled = 0;
    inode->isRoot = 0;

    if (inode->prev != NULL) {
  iprev = inode->prev;
  /*
  * Inherit the following information:
  * ---------------------------------
  *
  * In-scope namespaces
  */
  inode->inScopeNs = iprev->inScopeNs;
  /*
  * Info for literal result elements
  */
  inode->litResElemInfo = iprev->litResElemInfo;
  inode->nsChanged = iprev->nsChanged;
  /*
  * Excluded result namespaces
  */
  inode->exclResultNs = iprev->exclResultNs;
  /*
  * Extension instruction namespaces
  */
  inode->extElemNs = iprev->extElemNs;
  /*
  * Whitespace preservation
  */
  inode->preserveWhitespace = iprev->preserveWhitespace;
  /*
  * Forwards-compatible mode
  */
  inode->forwardsCompat = iprev->forwardsCompat;
    } else {
  inode->inScopeNs = NULL;
  inode->exclResultNs = NULL;
  inode->extElemNs = NULL;
  inode->preserveWhitespace = 0;
  inode->forwardsCompat = 0;
    }

    return(inode);
}

/*
* xsltCompilerNodePop:
*
* @cctxt: the compilation context
* @node: the node to be pushed (this can also be the doc-node)
*
* Pops the current node info.
*/
static void
xsltCompilerNodePop(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    if (cctxt->inode == NULL) {
  xmlGenericError(xmlGenericErrorContext,
      "xsltCompilerNodePop: Top-node mismatch.\n");
  return;
    }
    /*
    * NOTE: Be carefull with the @node, since it might be
    *  a doc-node.
    */
    if (cctxt->inode->node != node) {
  xmlGenericError(xmlGenericErrorContext,
  "xsltCompilerNodePop: Node mismatch.\n");
  goto mismatch;
    }
    if (cctxt->inode->depth != cctxt->depth) {
  xmlGenericError(xmlGenericErrorContext,
  "xsltCompilerNodePop: Depth mismatch.\n");
  goto mismatch;
    }
    cctxt->depth--;
    /*
    * Pop information of variables.
    */
    if ((cctxt->ivar) && (cctxt->ivar->depth > cctxt->depth))
  xsltCompilerVarInfoPop(cctxt);

    cctxt->inode = cctxt->inode->prev;
    if (cctxt->inode != NULL)
  cctxt->inode->curChildType = 0;
    return;

mismatch:
    {
  const xmlChar *nsName = NULL, *name = NULL;
  const xmlChar *infnsName = NULL, *infname = NULL;

  if (node) {
      if (node->type == XML_ELEMENT_NODE) {
    name = node->name;
    if (node->ns != NULL)
        nsName = node->ns->href;
    else
        nsName = BAD_CAST "";
      } else {
    name = BAD_CAST "#document";
    nsName = BAD_CAST "";
      }
  } else
      name = BAD_CAST "Not given";

  if (cctxt->inode->node) {
      if (node->type == XML_ELEMENT_NODE) {
    infname = cctxt->inode->node->name;
    if (cctxt->inode->node->ns != NULL)
        infnsName = cctxt->inode->node->ns->href;
    else
        infnsName = BAD_CAST "";
      } else {
    infname = BAD_CAST "#document";
    infnsName = BAD_CAST "";
      }
  } else
      infname = BAD_CAST "Not given";


  xmlGenericError(xmlGenericErrorContext,
      "xsltCompilerNodePop: Given   : '%s' URI '%s'\n",
      name, nsName);
  xmlGenericError(xmlGenericErrorContext,
      "xsltCompilerNodePop: Expected: '%s' URI '%s'\n",
      infname, infnsName);
    }
}

/*
* xsltCompilerBuildInScopeNsList:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltNsListContainerPtr
xsltCompilerBuildInScopeNsList(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xsltNsListContainerPtr nsi = NULL;
    xmlNsPtr *list = NULL, ns;
    int i, maxns = 5;
    /*
    * Create a new ns-list for this position in the node-tree.
    * xmlGetNsList() will return NULL, if there are no ns-decls in the
    * tree. Note that the ns-decl for the XML namespace is not added
    * to the resulting list; the XPath module handles the XML namespace
    * internally.
    */
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE) {
            ns = node->nsDef;
            while (ns != NULL) {
                if (nsi == NULL) {
        nsi = (xsltNsListContainerPtr)
      xmlMalloc(sizeof(xsltNsListContainer));
        if (nsi == NULL) {
      xsltTransformError(NULL, cctxt->style, NULL,
          "xsltCompilerBuildInScopeNsList: "
          "malloc failed!\n");
      goto internal_err;
        }
        memset(nsi, 0, sizeof(xsltNsListContainer));
                    nsi->list =
                        (xmlNsPtr *) xmlMalloc(maxns * sizeof(xmlNsPtr));
                    if (nsi->list == NULL) {
      xsltTransformError(NULL, cctxt->style, NULL,
          "xsltCompilerBuildInScopeNsList: "
          "malloc failed!\n");
      goto internal_err;
                    }
                    nsi->list[0] = NULL;
                }
    /*
    * Skip shadowed namespace bindings.
    */
                for (i = 0; i < nsi->totalNumber; i++) {
                    if ((ns->prefix == nsi->list[i]->prefix) ||
                        (xmlStrEqual(ns->prefix, nsi->list[i]->prefix)))
        break;
                }
                if (i >= nsi->totalNumber) {
                    if (nsi->totalNumber +1 >= maxns) {
                        maxns *= 2;
      nsi->list =
          (xmlNsPtr *) xmlRealloc(nsi->list,
        maxns * sizeof(xmlNsPtr));
                        if (nsi->list == NULL) {
                            xsltTransformError(NULL, cctxt->style, NULL,
        "xsltCompilerBuildInScopeNsList: "
        "realloc failed!\n");
        goto internal_err;
                        }
                    }
                    nsi->list[nsi->totalNumber++] = ns;
                    nsi->list[nsi->totalNumber] = NULL;
                }

                ns = ns->next;
            }
        }
        node = node->parent;
    }
    if (nsi == NULL)
  return(NULL);
    /*
    * Move the default namespace to last position.
    */
    nsi->xpathNumber = nsi->totalNumber;
    for (i = 0; i < nsi->totalNumber; i++) {
  if (nsi->list[i]->prefix == NULL) {
      ns = nsi->list[i];
      nsi->list[i] = nsi->list[nsi->totalNumber-1];
      nsi->list[nsi->totalNumber-1] = ns;
      nsi->xpathNumber--;
      break;
  }
    }
    /*
    * Store the ns-list in the stylesheet.
    */
    if (xsltPointerListAddSize(
  (xsltPointerListPtr)cctxt->psData->inScopeNamespaces,
  (void *) nsi, 5) == -1)
    {
  xmlFree(nsi);
  nsi = NULL;
  xsltTransformError(NULL, cctxt->style, NULL,
      "xsltCompilerBuildInScopeNsList: failed to add ns-info.\n");
  goto internal_err;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
  cctxt->inode->nsChanged = 1;

    return(nsi);

internal_err:
    if (list != NULL)
  xmlFree(list);
    cctxt->style->errors++;
    return(NULL);
}

static int
xsltParseNsPrefixList(xsltCompilerCtxtPtr cctxt,
          xsltPointerListPtr list,
          xmlNodePtr node,
          const xmlChar *value)
{
    xmlChar *cur, *end;
    xmlNsPtr ns;

    if ((cctxt == NULL) || (value == NULL) || (list == NULL))
  return(-1);

    list->number = 0;

    cur = (xmlChar *) value;
    while (*cur != 0) {
  while (IS_BLANK(*cur)) cur++;
  if (*cur == 0)
      break;
  end = cur;
  while ((*end != 0) && (!IS_BLANK(*end))) end++;
  cur = xmlStrndup(cur, end - cur);
  if (cur == NULL) {
      cur = end;
      continue;
  }
  /*
  * TODO: Export and use xmlSearchNsByPrefixStrict()
  *   in Libxml2, tree.c, since xmlSearchNs() is in most
  *   cases not efficient and in some cases not correct.
  *
  * XSLT-2 TODO: XSLT 2.0 allows an additional "#all" value.
  */
  if ((cur[0] == '#') &&
      xmlStrEqual(cur, (const xmlChar *)"#default"))
      ns = xmlSearchNs(cctxt->style->doc, node, NULL);
  else
      ns = xmlSearchNs(cctxt->style->doc, node, cur);

  if (ns == NULL) {
      /*
      * TODO: Better to report the attr-node, otherwise
      *  the user won't know which attribute was invalid.
      */
      xsltTransformError(NULL, cctxt->style, node,
    "No namespace binding in scope for prefix '%s'.\n", cur);
      /*
      * XSLT-1.0: "It is an error if there is no namespace
      *  bound to the prefix on the element bearing the
      *  exclude-result-prefixes or xsl:exclude-result-prefixes
      *  attribute."
      */
      cctxt->style->errors++;
  } else {
#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
    "resolved prefix '%s'\n", cur);
#endif
      /*
      * Note that we put the namespace name into the dict.
      */
      if (xsltPointerListAddSize(list,
    (void *) xmlDictLookup(cctxt->style->dict,
    ns->href, -1), 5) == -1)
      {
    xmlFree(cur);
    goto internal_err;
      }
  }
  xmlFree(cur);

  cur = end;
    }
    return(0);

internal_err:
    cctxt->style->errors++;
    return(-1);
}

/**
 * xsltCompilerUtilsCreateMergedList:
 * @dest: the destination list (optional)
 * @first: the first list
 * @second: the second list (optional)
 *
 * Appends the content of @second to @first into @destination.
 * If @destination is NULL a new list will be created.
 *
 * Returns the merged list of items or NULL if there's nothing to merge.
 */
static xsltPointerListPtr
xsltCompilerUtilsCreateMergedList(xsltPointerListPtr first,
          xsltPointerListPtr second)
{
    xsltPointerListPtr ret;
    size_t num;

    if (first)
  num = first->number;
    else
  num = 0;
    if (second)
  num += second->number;
    if (num == 0)
  return(NULL);
    ret = xsltPointerListCreate(num);
    if (ret == NULL)
  return(NULL);
    /*
    * Copy contents.
    */
    if ((first != NULL) &&  (first->number != 0)) {
  memcpy(ret->items, first->items,
      first->number * sizeof(void *));
  if ((second != NULL) && (second->number != 0))
      memcpy(ret->items + first->number, second->items,
    second->number * sizeof(void *));
    } else if ((second != NULL) && (second->number != 0))
  memcpy(ret->items, (void *) second->items,
      second->number * sizeof(void *));
    ret->number = num;
    return(ret);
}

/*
* xsltParseExclResultPrefixes:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltPointerListPtr
xsltParseExclResultPrefixes(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,
          xsltPointerListPtr def,
          int instrCategory)
{
    xsltPointerListPtr list = NULL;
    xmlChar *value;
    xmlAttrPtr attr;

    if ((cctxt == NULL) || (node == NULL))
  return(NULL);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
  attr = xmlHasNsProp(node, BAD_CAST "exclude-result-prefixes", NULL);
    else
  attr = xmlHasNsProp(node, BAD_CAST "exclude-result-prefixes",
      XSLT_NAMESPACE);
    if (attr == NULL)
  return(def);

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
  /*
  * Mark the XSLT attr.
  */
  attr->psvi = (void *) xsltXSLTAttrMarker;
    }

    if ((attr->children != NULL) &&
  (attr->children->content != NULL))
  value = attr->children->content;
    else {
  xsltTransformError(NULL, cctxt->style, node,
      "Attribute 'exclude-result-prefixes': Invalid value.\n");
  cctxt->style->errors++;
  return(def);
    }

    if (xsltParseNsPrefixList(cctxt, cctxt->tmpList, node,
  BAD_CAST value) != 0)
  goto exit;
    if (cctxt->tmpList->number == 0)
  goto exit;
    /*
    * Merge the list with the inherited list.
    */
    list = xsltCompilerUtilsCreateMergedList(def, cctxt->tmpList);
    if (list == NULL)
  goto exit;
    /*
    * Store the list in the stylesheet/compiler context.
    */
    if (xsltPointerListAddSize(
  cctxt->psData->exclResultNamespaces, list, 5) == -1)
    {
  xsltPointerListFree(list);
  list = NULL;
  goto exit;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
  cctxt->inode->nsChanged = 1;

exit:
    if (list != NULL)
  return(list);
    else
  return(def);
}

/*
* xsltParseExtElemPrefixes:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltPointerListPtr
xsltParseExtElemPrefixes(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,
       xsltPointerListPtr def,
       int instrCategory)
{
    xsltPointerListPtr list = NULL;
    xmlAttrPtr attr;
    xmlChar *value;
    int i;

    if ((cctxt == NULL) || (node == NULL))
  return(NULL);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
  attr = xmlHasNsProp(node, BAD_CAST "extension-element-prefixes", NULL);
    else
  attr = xmlHasNsProp(node, BAD_CAST "extension-element-prefixes",
      XSLT_NAMESPACE);
    if (attr == NULL)
  return(def);

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
  /*
  * Mark the XSLT attr.
  */
  attr->psvi = (void *) xsltXSLTAttrMarker;
    }

    if ((attr->children != NULL) &&
  (attr->children->content != NULL))
  value = attr->children->content;
    else {
  xsltTransformError(NULL, cctxt->style, node,
      "Attribute 'extension-element-prefixes': Invalid value.\n");
  cctxt->style->errors++;
  return(def);
    }


    if (xsltParseNsPrefixList(cctxt, cctxt->tmpList, node,
  BAD_CAST value) != 0)
  goto exit;

    if (cctxt->tmpList->number == 0)
  goto exit;
    /*
    * REVISIT: Register the extension namespaces.
    */
    for (i = 0; i < cctxt->tmpList->number; i++)
  xsltRegisterExtPrefix(cctxt->style, NULL,
  BAD_CAST cctxt->tmpList->items[i]);
    /*
    * Merge the list with the inherited list.
    */
    list = xsltCompilerUtilsCreateMergedList(def, cctxt->tmpList);
    if (list == NULL)
  goto exit;
    /*
    * Store the list in the stylesheet.
    */
    if (xsltPointerListAddSize(
  cctxt->psData->extElemNamespaces, list, 5) == -1)
    {
  xsltPointerListFree(list);
  list = NULL;
  goto exit;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
  cctxt->inode->nsChanged = 1;

exit:
    if (list != NULL)
  return(list);
    else
  return(def);
}

/*
* xsltParseAttrXSLTVersion:
*
* @cctxt: the compilation context
* @node: the element-node
* @isXsltElem: whether this is an XSLT element
*
* Parses the attribute xsl:version.
*
* Returns 1 if there was such an attribute, 0 if not and
*         -1 if an internal or API error occured.
*/
static int
xsltParseAttrXSLTVersion(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,
       int instrCategory)
{
    xmlChar *value;
    xmlAttrPtr attr;

    if ((cctxt == NULL) || (node == NULL))
  return(-1);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
  attr = xmlHasNsProp(node, BAD_CAST "version", NULL);
    else
  attr = xmlHasNsProp(node, BAD_CAST "version", XSLT_NAMESPACE);

    if (attr == NULL)
  return(0);

    attr->psvi = (void *) xsltXSLTAttrMarker;

    if ((attr->children != NULL) &&
  (attr->children->content != NULL))
  value = attr->children->content;
    else {
  xsltTransformError(NULL, cctxt->style, node,
      "Attribute 'version': Invalid value.\n");
  cctxt->style->errors++;
  return(1);
    }

    if (! xmlStrEqual(value, (const xmlChar *)"1.0")) {
  cctxt->inode->forwardsCompat = 1;
  /*
  * TODO: To what extent do we support the
  *  forwards-compatible mode?
  */
  /*
  * Report this only once per compilation episode.
  */
  if (! cctxt->hasForwardsCompat) {
      cctxt->hasForwardsCompat = 1;
      cctxt->errSeverity = XSLT_ERROR_SEVERITY_WARNING;
      xsltTransformError(NULL, cctxt->style, node,
    "Warning: the attribute xsl:version specifies a value "
    "different from '1.0'. Switching to forwards-compatible "
    "mode. Only features of XSLT 1.0 are supported by this "
    "processor.\n");
      cctxt->style->warnings++;
      cctxt->errSeverity = XSLT_ERROR_SEVERITY_ERROR;
  }
    } else {
  cctxt->inode->forwardsCompat = 0;
    }

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
  /*
  * Set a marker on XSLT attributes.
  */
  attr->psvi = (void *) xsltXSLTAttrMarker;
    }
    return(1);
}

static int
xsltParsePreprocessStylesheetTree(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xmlNodePtr deleteNode, cur, txt, textNode = NULL;
    xmlDocPtr doc;
    xsltStylesheetPtr style;
    int internalize = 0, findSpaceAttr;
    int xsltStylesheetElemDepth;
    xmlAttrPtr attr;
    xmlChar *value;
    const xmlChar *name, *nsNameXSLT = NULL;
    int strictWhitespace, inXSLText = 0;
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    xsltNsMapPtr nsMapItem;
#endif

    if ((cctxt == NULL) || (cctxt->style == NULL) ||
  (node == NULL) || (node->type != XML_ELEMENT_NODE))
        return(-1);

    doc = node->doc;
    if (doc == NULL)
  goto internal_err;

    style = cctxt->style;
    if ((style->dict != NULL) && (doc->dict == style->dict))
  internalize = 1;
    else
        style->internalized = 0;

    /*
    * Init value of xml:space. Since this might be an embedded
    * stylesheet, this is needed to be performed on the element
    * where the stylesheet is rooted at, taking xml:space of
    * ancestors into account.
    */
    if (! cctxt->simplified)
  xsltStylesheetElemDepth = cctxt->depth +1;
    else
  xsltStylesheetElemDepth = 0;

    if (xmlNodeGetSpacePreserve(node) != 1)
  cctxt->inode->preserveWhitespace = 0;
    else
  cctxt->inode->preserveWhitespace = 1;

    /*
    * Eval if we should keep the old incorrect behaviour.
    */
    strictWhitespace = (cctxt->strict != 0) ? 1 : 0;

    nsNameXSLT = xsltConstNamespaceNameXSLT;

    deleteNode = NULL;
    cur = node;
    while (cur != NULL) {
  if (deleteNode != NULL) {

#ifdef WITH_XSLT_DEBUG_BLANKS
      xsltGenericDebug(xsltGenericDebugContext,
       "xsltParsePreprocessStylesheetTree: removing node\n");
#endif
      xmlUnlinkNode(deleteNode);
      xmlFreeNode(deleteNode);
      deleteNode = NULL;
  }
  if (cur->type == XML_ELEMENT_NODE) {

      /*
      * Clear the PSVI field.
      */
      cur->psvi = NULL;

      xsltCompilerNodePush(cctxt, cur);

      inXSLText = 0;
      textNode = NULL;
      findSpaceAttr = 1;
      cctxt->inode->stripWhitespace = 0;
      /*
      * TODO: I'd love to use a string pointer comparison here :-/
      */
      if (IS_XSLT_ELEM(cur)) {
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    if (cur->ns->href != nsNameXSLT) {
        nsMapItem = xsltNewNamespaceMapItem(cctxt,
      doc, cur->ns, cur);
        if (nsMapItem == NULL)
      goto internal_err;
        cur->ns->href = nsNameXSLT;
    }
#endif

    if (cur->name == NULL)
        goto process_attributes;
    /*
    * Mark the XSLT element for later recognition.
    * TODO: Using the marker is still too dangerous, since if
    *   the parsing mechanism leaves out an XSLT element, then
    *   this might hit the transformation-mechanism, which
    *   will break if it doesn't expect such a marker.
    */
    /* cur->psvi = (void *) xsltXSLTElemMarker; */

    /*
    * XSLT 2.0: "Any whitespace text node whose parent is
    * one of the following elements is removed from the "
    * tree, regardless of any xml:space attributes:..."
    * xsl:apply-imports,
    * xsl:apply-templates,
    * xsl:attribute-set,
    * xsl:call-template,
    * xsl:choose,
    * xsl:stylesheet, xsl:transform.
    * XSLT 2.0: xsl:analyze-string,
    *           xsl:character-map,
    *           xsl:next-match
    *
    * TODO: I'd love to use a string pointer comparison here :-/
    */
    name = cur->name;
    switch (*name) {
        case 't':
      if ((name[0] == 't') && (name[1] == 'e') &&
          (name[2] == 'x') && (name[3] == 't') &&
          (name[4] == 0))
      {
          /*
          * Process the xsl:text element.
          * ----------------------------
          * Mark it for later recognition.
          */
          cur->psvi = (void *) xsltXSLTTextMarker;
          /*
          * For stylesheets, the set of
          * whitespace-preserving element names
          * consists of just xsl:text.
          */
          findSpaceAttr = 0;
          cctxt->inode->preserveWhitespace = 1;
          inXSLText = 1;
      }
      break;
        case 'c':
      if (xmlStrEqual(name, BAD_CAST "choose") ||
          xmlStrEqual(name, BAD_CAST "call-template"))
          cctxt->inode->stripWhitespace = 1;
      break;
        case 'a':
      if (xmlStrEqual(name, BAD_CAST "apply-templates") ||
          xmlStrEqual(name, BAD_CAST "apply-imports") ||
          xmlStrEqual(name, BAD_CAST "attribute-set"))

          cctxt->inode->stripWhitespace = 1;
      break;
        default:
      if (xsltStylesheetElemDepth == cctxt->depth) {
          /*
          * This is a xsl:stylesheet/xsl:transform.
          */
          cctxt->inode->stripWhitespace = 1;
          break;
      }

      if ((cur->prev != NULL) &&
          (cur->prev->type == XML_TEXT_NODE))
      {
          /*
          * XSLT 2.0 : "Any whitespace text node whose
          *  following-sibling node is an xsl:param or
          *  xsl:sort element is removed from the tree,
          *  regardless of any xml:space attributes."
          */
          if (((*name == 'p') || (*name == 's')) &&
        (xmlStrEqual(name, BAD_CAST "param") ||
         xmlStrEqual(name, BAD_CAST "sort")))
          {
        do {
            if (IS_BLANK_NODE(cur->prev)) {
          txt = cur->prev;
          xmlUnlinkNode(txt);
          xmlFreeNode(txt);
            } else {
          /*
          * This will result in a content
          * error, when hitting the parsing
          * functions.
          */
          break;
            }
        } while (cur->prev);
          }
      }
      break;
    }
      }

process_attributes:
      /*
      * Process attributes.
      * ------------------
      */
      if (cur->properties != NULL) {
    if (cur->children == NULL)
        findSpaceAttr = 0;
    attr = cur->properties;
    do {
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
        if ((attr->ns) && (attr->ns->href != nsNameXSLT) &&
      xmlStrEqual(attr->ns->href, nsNameXSLT))
        {
      nsMapItem = xsltNewNamespaceMapItem(cctxt,
          doc, attr->ns, cur);
      if (nsMapItem == NULL)
          goto internal_err;
      attr->ns->href = nsNameXSLT;
        }
#endif
        if (internalize) {
      /*
      * Internalize the attribute's value; the goal is to
      * speed up operations and minimize used space by
      * compiled stylesheets.
      */
      txt = attr->children;
      /*
      * NOTE that this assumes only one
      *  text-node in the attribute's content.
      */
      if ((txt != NULL) && (txt->content != NULL) &&
          (!xmlDictOwns(style->dict, txt->content)))
      {
          value = (xmlChar *) xmlDictLookup(style->dict,
        txt->content, -1);
          xmlNodeSetContent(txt, NULL);
          txt->content = value;
      }
        }
        /*
        * Process xml:space attributes.
        * ----------------------------
        */
        if ((findSpaceAttr != 0) &&
      (attr->ns != NULL) &&
      (attr->name != NULL) &&
      (attr->name[0] == 's') &&
      (attr->ns->prefix != NULL) &&
      (attr->ns->prefix[0] == 'x') &&
      (attr->ns->prefix[1] == 'm') &&
      (attr->ns->prefix[2] == 'l') &&
      (attr->ns->prefix[3] == 0))
        {
      value = xmlGetNsProp(cur, BAD_CAST "space",
          XML_XML_NAMESPACE);
      if (value != NULL) {
          if (xmlStrEqual(value, BAD_CAST "preserve")) {
        cctxt->inode->preserveWhitespace = 1;
          } else if (xmlStrEqual(value, BAD_CAST "default")) {
        cctxt->inode->preserveWhitespace = 0;
          } else {
        /* Invalid value for xml:space. */
        xsltTransformError(NULL, style, cur,
            "Attribute xml:space: Invalid value.\n");
        cctxt->style->warnings++;
          }
          findSpaceAttr = 0;
          xmlFree(value);
      }

        }
        attr = attr->next;
    } while (attr != NULL);
      }
      /*
      * We'll descend into the children of element nodes only.
      */
      if (cur->children != NULL) {
    cur = cur->children;
    continue;
      }
  } else if ((cur->type == XML_TEXT_NODE) ||
    (cur->type == XML_CDATA_SECTION_NODE))
  {
      /*
      * Merge adjacent text/CDATA-section-nodes
      * ---------------------------------------
      * In order to avoid breaking of existing stylesheets,
      * if the old behaviour is wanted (strictWhitespace == 0),
      * then we *won't* merge adjacent text-nodes
      * (except in xsl:text); this will ensure that whitespace-only
      * text nodes are (incorrectly) not stripped in some cases.
      *
      * Example:               : <foo>  <!-- bar -->zoo</foo>
      * Corrent (strict) result: <foo>  zoo</foo>
      * Incorrect (old) result : <foo>zoo</foo>
      *
      * NOTE that we *will* merge adjacent text-nodes if
      * they are in xsl:text.
      * Example, the following:
      * <xsl:text>  <!-- bar -->zoo<xsl:text>
      * will result in both cases in:
      * <xsl:text>  zoo<xsl:text>
      */
      cur->type = XML_TEXT_NODE;
      if ((strictWhitespace != 0) || (inXSLText != 0)) {
    /*
    * New behaviour; merge nodes.
    */
    if (textNode == NULL)
        textNode = cur;
    else {
        if (cur->content != NULL)
      xmlNodeAddContent(textNode, cur->content);
        deleteNode = cur;
    }
    if ((cur->next == NULL) ||
        (cur->next->type == XML_ELEMENT_NODE))
        goto end_of_text;
    else
        goto next_sibling;
      } else {
    /*
    * Old behaviour.
    */
    if (textNode == NULL)
        textNode = cur;
    goto end_of_text;
      }
  } else if ((cur->type == XML_COMMENT_NODE) ||
      (cur->type == XML_PI_NODE))
  {
      /*
      * Remove processing instructions and comments.
      */
      deleteNode = cur;
      if ((cur->next == NULL) ||
    (cur->next->type == XML_ELEMENT_NODE))
    goto end_of_text;
      else
    goto next_sibling;
  } else {
      textNode = NULL;
      /*
      * Invalid node-type for this data-model.
      */
      xsltTransformError(NULL, style, cur,
    "Invalid type of node for the XSLT data model.\n");
      cctxt->style->errors++;
      goto next_sibling;
  }

end_of_text:
  if (textNode) {
      value = textNode->content;
      /*
      * At this point all adjacent text/CDATA-section nodes
      * have been merged.
      *
      * Strip whitespace-only text-nodes.
      * (cctxt->inode->stripWhitespace)
      */
      if ((value == NULL) || (*value == 0) ||
    (((cctxt->inode->stripWhitespace) ||
      (! cctxt->inode->preserveWhitespace)) &&
     IS_BLANK(*value) &&
     xsltIsBlank(value)))
      {
    if (textNode != cur) {
        xmlUnlinkNode(textNode);
        xmlFreeNode(textNode);
    } else
        deleteNode = textNode;
    textNode = NULL;
    goto next_sibling;
      }
      /*
      * Convert CDATA-section nodes to text-nodes.
      * TODO: Can this produce problems?
      */
      if (textNode->type != XML_TEXT_NODE) {
    textNode->type = XML_TEXT_NODE;
    textNode->name = xmlStringText;
      }
      if (internalize &&
    (textNode->content != NULL) &&
    (!xmlDictOwns(style->dict, textNode->content)))
      {
    /*
    * Internalize the string.
    */
    value = (xmlChar *) xmlDictLookup(style->dict,
        textNode->content, -1);
    xmlNodeSetContent(textNode, NULL);
    textNode->content = value;
      }
      textNode = NULL;
      /*
      * Note that "disable-output-escaping" of the xsl:text
      * element will be applied at a later level, when
      * XSLT elements are processed.
      */
  }

next_sibling:
  if (cur->type == XML_ELEMENT_NODE) {
      xsltCompilerNodePop(cctxt, cur);
  }
  if (cur == node)
      break;
  if (cur->next != NULL) {
      cur = cur->next;
  } else {
      cur = cur->parent;
      inXSLText = 0;
      goto next_sibling;
  };
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
   "xsltParsePreprocessStylesheetTree: removing node\n");
#endif
  xmlUnlinkNode(deleteNode);
  xmlFreeNode(deleteNode);
    }
    return(0);

internal_err:
    return(-1);
}

#endif /* XSLT_REFACTORED */

#ifdef XSLT_REFACTORED
#else
static void
xsltPreprocessStylesheet(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlNodePtr deleteNode, styleelem;
    int internalize = 0;

    if ((style == NULL) || (cur == NULL))
        return;

    if ((cur->doc != NULL) && (style->dict != NULL) &&
        (cur->doc->dict == style->dict))
  internalize = 1;
    else
        style->internalized = 0;

    if ((cur != NULL) && (IS_XSLT_ELEM(cur)) &&
        (IS_XSLT_NAME(cur, "stylesheet"))) {
  styleelem = cur;
    } else {
        styleelem = NULL;
    }

    /*
     * This content comes from the stylesheet
     * For stylesheets, the set of whitespace-preserving
     * element names consists of just xsl:text.
     */
    deleteNode = NULL;
    while (cur != NULL) {
  if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
      xsltGenericDebug(xsltGenericDebugContext,
       "xsltPreprocessStylesheet: removing ignorable blank node\n");
#endif
      xmlUnlinkNode(deleteNode);
      xmlFreeNode(deleteNode);
      deleteNode = NULL;
  }
  if (cur->type == XML_ELEMENT_NODE) {
      int exclPrefixes;
      /*
       * Internalize attributes values.
       */
      if ((internalize) && (cur->properties != NULL)) {
          xmlAttrPtr attr = cur->properties;
    xmlNodePtr txt;

    while (attr != NULL) {
        txt = attr->children;
        if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
            (txt->content != NULL) &&
      (!xmlDictOwns(style->dict, txt->content)))
        {
      xmlChar *tmp;

      /*
       * internalize the text string, goal is to speed
       * up operations and minimize used space by compiled
       * stylesheets.
       */
      tmp = (xmlChar *) xmlDictLookup(style->dict,
                                      txt->content, -1);
      if (tmp != txt->content) {
          xmlNodeSetContent(txt, NULL);
          txt->content = tmp;
      }
        }
        attr = attr->next;
    }
      }
      if (IS_XSLT_ELEM(cur)) {
    exclPrefixes = 0;
    if (IS_XSLT_NAME(cur, "text")) {
        for (;exclPrefixes > 0;exclPrefixes--)
      exclPrefixPop(style);
        goto skip_children;
    }
      } else {
    exclPrefixes = xsltParseStylesheetExcludePrefix(style, cur, 0);
      }

      if ((cur->nsDef != NULL) && (style->exclPrefixNr > 0)) {
    xmlNsPtr ns = cur->nsDef, prev = NULL, next;
    xmlNodePtr root = NULL;
    int i, moved;

    root = xmlDocGetRootElement(cur->doc);
    if ((root != NULL) && (root != cur)) {
        while (ns != NULL) {
      moved = 0;
      next = ns->next;
      for (i = 0;i < style->exclPrefixNr;i++) {
          if ((ns->prefix != NULL) &&
              (xmlStrEqual(ns->href,
               style->exclPrefixTab[i]))) {
        /*
         * Move the namespace definition on the root
         * element to avoid duplicating it without
         * loosing it.
         */
        if (prev == NULL) {
            cur->nsDef = ns->next;
        } else {
            prev->next = ns->next;
        }
        ns->next = root->nsDef;
        root->nsDef = ns;
        moved = 1;
        break;
          }
      }
      if (moved == 0)
          prev = ns;
      ns = next;
        }
    }
      }
      /*
       * If we have prefixes locally, recurse and pop them up when
       * going back
       */
      if (exclPrefixes > 0) {
    xsltPreprocessStylesheet(style, cur->children);
    for (;exclPrefixes > 0;exclPrefixes--)
        exclPrefixPop(style);
    goto skip_children;
      }
  } else if (cur->type == XML_TEXT_NODE) {
      if (IS_BLANK_NODE(cur)) {
    if (xmlNodeGetSpacePreserve(cur->parent) != 1) {
        deleteNode = cur;
    }
      } else if ((cur->content != NULL) && (internalize) &&
                 (!xmlDictOwns(style->dict, cur->content))) {
    xmlChar *tmp;

    /*
     * internalize the text string, goal is to speed
     * up operations and minimize used space by compiled
     * stylesheets.
     */
    tmp = (xmlChar *) xmlDictLookup(style->dict, cur->content, -1);
    xmlNodeSetContent(cur, NULL);
    cur->content = tmp;
      }
  } else if ((cur->type != XML_ELEMENT_NODE) &&
       (cur->type != XML_CDATA_SECTION_NODE)) {
      deleteNode = cur;
      goto skip_children;
  }

  /*
   * Skip to next node. In case of a namespaced element children of
   * the stylesheet and not in the XSLT namespace and not an extension
   * element, ignore its content.
   */
  if ((cur->type == XML_ELEMENT_NODE) && (cur->ns != NULL) &&
      (styleelem != NULL) && (cur->parent == styleelem) &&
      (!xmlStrEqual(cur->ns->href, XSLT_NAMESPACE)) &&
      (!xsltCheckExtURI(style, cur->ns->href))) {
      goto skip_children;
  } else if (cur->children != NULL) {
      cur = cur->children;
      continue;
  }

skip_children:
  if (cur->next != NULL) {
      cur = cur->next;
      continue;
  }
  do {

      cur = cur->parent;
      if (cur == NULL)
    break;
      if (cur == (xmlNodePtr) style->doc) {
    cur = NULL;
    break;
      }
      if (cur->next != NULL) {
    cur = cur->next;
    break;
      }
  } while (cur != NULL);
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
   "xsltPreprocessStylesheet: removing ignorable blank node\n");
#endif
  xmlUnlinkNode(deleteNode);
  xmlFreeNode(deleteNode);
    }
}
#endif /* end of else XSLT_REFACTORED */

/**
 * xsltGatherNamespaces:
 * @style:  the XSLT stylesheet
 *
 * Browse the stylesheet and build the namspace hash table which
 * will be used for XPath interpretation. If needed do a bit of normalization
 */

static void
xsltGatherNamespaces(xsltStylesheetPtr style) {
    xmlNodePtr cur;
    const xmlChar *URI;

    if (style == NULL)
        return;
    /*
     * TODO: basically if the stylesheet uses the same prefix for different
     *       patterns, well they may be in problem, hopefully they will get
     *       a warning first.
     */
    /*
    * TODO: Eliminate the use of the hash for XPath expressions.
    *   An expression should be evaluated in the context of the in-scope
    *   namespaces; eliminate the restriction of an XML document to contain
    *   no duplicate prefixes for different namespace names.
    *
    */
    cur = xmlDocGetRootElement(style->doc);
    while (cur != NULL) {
  if (cur->type == XML_ELEMENT_NODE) {
      xmlNsPtr ns = cur->nsDef;
      while (ns != NULL) {
    if (ns->prefix != NULL) {
        if (style->nsHash == NULL) {
      style->nsHash = xmlHashCreate(10);
      if (style->nsHash == NULL) {
          xsltTransformError(NULL, style, cur,
     "xsltGatherNamespaces: failed to create hash table\n");
          style->errors++;
          return;
      }
        }
        URI = xmlHashLookup(style->nsHash, ns->prefix);
        if ((URI != NULL) && (!xmlStrEqual(URI, ns->href))) {
      xsltTransformError(NULL, style, cur,
       "Namespaces prefix %s used for multiple namespaces\n",ns->prefix);
      style->warnings++;
        } else if (URI == NULL) {
      xmlHashUpdateEntry(style->nsHash, ns->prefix,
          (void *) ns->href, NULL);

#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
     "Added namespace: %s mapped to %s\n", ns->prefix, ns->href);
#endif
        }
    }
    ns = ns->next;
      }
  }

  /*
   * Skip to next node
   */
  if (cur->children != NULL) {
      if (cur->children->type != XML_ENTITY_DECL) {
    cur = cur->children;
    continue;
      }
  }
  if (cur->next != NULL) {
      cur = cur->next;
      continue;
  }

  do {
      cur = cur->parent;
      if (cur == NULL)
    break;
      if (cur == (xmlNodePtr) style->doc) {
    cur = NULL;
    break;
      }
      if (cur->next != NULL) {
    cur = cur->next;
    break;
      }
  } while (cur != NULL);
    }
}

#ifdef XSLT_REFACTORED

static xsltStyleType
xsltGetXSLTElementTypeByNode(xsltCompilerCtxtPtr cctxt,
           xmlNodePtr node)
{
    if ((node == NULL) || (node->type != XML_ELEMENT_NODE) ||
  (node->name == NULL))
  return(0);

    if (node->name[0] == 'a') {
  if (IS_XSLT_NAME(node, "apply-templates"))
      return(XSLT_FUNC_APPLYTEMPLATES);
  else if (IS_XSLT_NAME(node, "attribute"))
      return(XSLT_FUNC_ATTRIBUTE);
  else if (IS_XSLT_NAME(node, "apply-imports"))
      return(XSLT_FUNC_APPLYIMPORTS);
  else if (IS_XSLT_NAME(node, "attribute-set"))
      return(0);

    } else if (node->name[0] == 'c') {
  if (IS_XSLT_NAME(node, "choose"))
      return(XSLT_FUNC_CHOOSE);
  else if (IS_XSLT_NAME(node, "copy"))
      return(XSLT_FUNC_COPY);
  else if (IS_XSLT_NAME(node, "copy-of"))
      return(XSLT_FUNC_COPYOF);
  else if (IS_XSLT_NAME(node, "call-template"))
      return(XSLT_FUNC_CALLTEMPLATE);
  else if (IS_XSLT_NAME(node, "comment"))
      return(XSLT_FUNC_COMMENT);

    } else if (node->name[0] == 'd') {
  if (IS_XSLT_NAME(node, "document"))
      return(XSLT_FUNC_DOCUMENT);
  else if (IS_XSLT_NAME(node, "decimal-format"))
      return(0);

    } else if (node->name[0] == 'e') {
  if (IS_XSLT_NAME(node, "element"))
      return(XSLT_FUNC_ELEMENT);

    } else if (node->name[0] == 'f') {
  if (IS_XSLT_NAME(node, "for-each"))
      return(XSLT_FUNC_FOREACH);
  else if (IS_XSLT_NAME(node, "fallback"))
      return(XSLT_FUNC_FALLBACK);

    } else if (*(node->name) == 'i') {
  if (IS_XSLT_NAME(node, "if"))
      return(XSLT_FUNC_IF);
  else if (IS_XSLT_NAME(node, "include"))
      return(0);
  else if (IS_XSLT_NAME(node, "import"))
      return(0);

    } else if (*(node->name) == 'k') {
  if (IS_XSLT_NAME(node, "key"))
      return(0);

    } else if (*(node->name) == 'm') {
  if (IS_XSLT_NAME(node, "message"))
      return(XSLT_FUNC_MESSAGE);

    } else if (*(node->name) == 'n') {
  if (IS_XSLT_NAME(node, "number"))
      return(XSLT_FUNC_NUMBER);
  else if (IS_XSLT_NAME(node, "namespace-alias"))
      return(0);

    } else if (*(node->name) == 'o') {
  if (IS_XSLT_NAME(node, "otherwise"))
      return(XSLT_FUNC_OTHERWISE);
  else if (IS_XSLT_NAME(node, "output"))
      return(0);

    } else if (*(node->name) == 'p') {
  if (IS_XSLT_NAME(node, "param"))
      return(XSLT_FUNC_PARAM);
  else if (IS_XSLT_NAME(node, "processing-instruction"))
      return(XSLT_FUNC_PI);
  else if (IS_XSLT_NAME(node, "preserve-space"))
      return(0);

    } else if (*(node->name) == 's') {
  if (IS_XSLT_NAME(node, "sort"))
      return(XSLT_FUNC_SORT);
  else if (IS_XSLT_NAME(node, "strip-space"))
      return(0);
  else if (IS_XSLT_NAME(node, "stylesheet"))
      return(0);

    } else if (node->name[0] == 't') {
  if (IS_XSLT_NAME(node, "text"))
      return(XSLT_FUNC_TEXT);
  else if (IS_XSLT_NAME(node, "template"))
      return(0);
  else if (IS_XSLT_NAME(node, "transform"))
      return(0);

    } else if (*(node->name) == 'v') {
  if (IS_XSLT_NAME(node, "value-of"))
      return(XSLT_FUNC_VALUEOF);
  else if (IS_XSLT_NAME(node, "variable"))
      return(XSLT_FUNC_VARIABLE);

    } else if (*(node->name) == 'w') {
  if (IS_XSLT_NAME(node, "when"))
      return(XSLT_FUNC_WHEN);
  if (IS_XSLT_NAME(node, "with-param"))
      return(XSLT_FUNC_WITHPARAM);
    }
    return(0);
}

/**
 * xsltParseAnyXSLTElem:
 *
 * @cctxt: the compilation context
 * @elem: the element node of the XSLT instruction
 *
 * Parses, validates the content models and compiles XSLT instructions.
 *
 * Returns 0 if everything's fine;
 *         -1 on API or internal errors.
 */
int
xsltParseAnyXSLTElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr elem)
{
    if ((cctxt == NULL) || (elem == NULL) ||
  (elem->type != XML_ELEMENT_NODE))
  return(-1);

    elem->psvi = NULL;

    if (! (IS_XSLT_ELEM_FAST(elem)))
  return(-1);
    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
  cctxt->inode->extContentHandled = 1;
    }

    xsltCompilerNodePush(cctxt, elem);
    /*
    * URGENT TODO: Find a way to speed up this annoying redundant
    *  textual node-name and namespace comparison.
    */
    if (cctxt->inode->prev->curChildType != 0)
  cctxt->inode->type = cctxt->inode->prev->curChildType;
    else
  cctxt->inode->type = xsltGetXSLTElementTypeByNode(cctxt, elem);
    /*
    * Update the in-scope namespaces if needed.
    */
    if (elem->nsDef != NULL)
  cctxt->inode->inScopeNs =
      xsltCompilerBuildInScopeNsList(cctxt, elem);
    /*
    * xsltStylePreCompute():
    *  This will compile the information found on the current
    *  element's attributes. NOTE that this won't process the
    *  children of the instruction.
    */
    xsltStylePreCompute(cctxt->style, elem);
    /*
    * TODO: How to react on errors in xsltStylePreCompute() ?
    */

    /*
    * Validate the content model of the XSLT-element.
    */
    switch (cctxt->inode->type) {
  case XSLT_FUNC_APPLYIMPORTS:
      /* EMPTY */
      goto empty_content;
  case XSLT_FUNC_APPLYTEMPLATES:
      /* <!-- Content: (xsl:sort | xsl:with-param)* --> */
      goto apply_templates;
  case XSLT_FUNC_ATTRIBUTE:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_CALLTEMPLATE:
      /* <!-- Content: xsl:with-param* --> */
      goto call_template;
  case XSLT_FUNC_CHOOSE:
      /* <!-- Content: (xsl:when+, xsl:otherwise?) --> */
      goto choose;
  case XSLT_FUNC_COMMENT:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_COPY:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_COPYOF:
      /* EMPTY */
      goto empty_content;
  case XSLT_FUNC_DOCUMENT: /* Extra one */
      /* ?? template ?? */
      goto sequence_constructor;
  case XSLT_FUNC_ELEMENT:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_FALLBACK:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_FOREACH:
      /* <!-- Content: (xsl:sort*, template) --> */
      goto for_each;
  case XSLT_FUNC_IF:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_OTHERWISE:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_MESSAGE:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_NUMBER:
      /* EMPTY */
      goto empty_content;
  case XSLT_FUNC_PARAM:
      /*
      * Check for redefinition.
      */
      if ((elem->psvi != NULL) && (cctxt->ivar != NULL)) {
    xsltVarInfoPtr ivar = cctxt->ivar;

    do {
        if ((ivar->name ==
       ((xsltStyleItemParamPtr) elem->psvi)->name) &&
      (ivar->nsName ==
       ((xsltStyleItemParamPtr) elem->psvi)->ns))
        {
      elem->psvi = NULL;
      xsltTransformError(NULL, cctxt->style, elem,
          "Redefinition of variable or parameter '%s'.\n",
          ivar->name);
      cctxt->style->errors++;
      goto error;
        }
        ivar = ivar->prev;
    } while (ivar != NULL);
      }
      /*  <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_PI:
      /*  <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_SORT:
      /* EMPTY */
      goto empty_content;
  case XSLT_FUNC_TEXT:
      /* <!-- Content: #PCDATA --> */
      goto text;
  case XSLT_FUNC_VALUEOF:
      /* EMPTY */
      goto empty_content;
  case XSLT_FUNC_VARIABLE:
      /*
      * Check for redefinition.
      */
      if ((elem->psvi != NULL) && (cctxt->ivar != NULL)) {
    xsltVarInfoPtr ivar = cctxt->ivar;

    do {
        if ((ivar->name ==
       ((xsltStyleItemVariablePtr) elem->psvi)->name) &&
      (ivar->nsName ==
       ((xsltStyleItemVariablePtr) elem->psvi)->ns))
        {
      elem->psvi = NULL;
      xsltTransformError(NULL, cctxt->style, elem,
          "Redefinition of variable or parameter '%s'.\n",
          ivar->name);
      cctxt->style->errors++;
      goto error;
        }
        ivar = ivar->prev;
    } while (ivar != NULL);
      }
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_WHEN:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  case XSLT_FUNC_WITHPARAM:
      /* <!-- Content: template --> */
      goto sequence_constructor;
  default:
#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
    "xsltParseXSLTNode: Unhandled XSLT element '%s'.\n",
    elem->name);
#endif
      xsltTransformError(NULL, cctxt->style, elem,
    "xsltParseXSLTNode: Internal error; "
    "unhandled XSLT element '%s'.\n", elem->name);
      cctxt->style->errors++;
      goto internal_err;
    }

apply_templates:
    /* <!-- Content: (xsl:sort | xsl:with-param)* --> */
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  do {
      if (child->type == XML_ELEMENT_NODE) {
    if (IS_XSLT_ELEM_FAST(child)) {
        if (xmlStrEqual(child->name, BAD_CAST "with-param")) {
      cctxt->inode->curChildType = XSLT_FUNC_WITHPARAM;
      xsltParseAnyXSLTElem(cctxt, child);
        } else if (xmlStrEqual(child->name, BAD_CAST "sort")) {
      cctxt->inode->curChildType = XSLT_FUNC_SORT;
      xsltParseAnyXSLTElem(cctxt, child);
        } else
      xsltParseContentError(cctxt->style, child);
    } else
        xsltParseContentError(cctxt->style, child);
      }
      child = child->next;
  } while (child != NULL);
    }
    goto exit;

call_template:
    /* <!-- Content: xsl:with-param* --> */
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  do {
      if (child->type == XML_ELEMENT_NODE) {
    if (IS_XSLT_ELEM_FAST(child)) {
        xsltStyleType type;

        type = xsltGetXSLTElementTypeByNode(cctxt, child);
        if (type == XSLT_FUNC_WITHPARAM) {
      cctxt->inode->curChildType = XSLT_FUNC_WITHPARAM;
      xsltParseAnyXSLTElem(cctxt, child);
        } else {
      xsltParseContentError(cctxt->style, child);
        }
    } else
        xsltParseContentError(cctxt->style, child);
      }
      child = child->next;
  } while (child != NULL);
    }
    goto exit;

text:
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  do {
      if ((child->type != XML_TEXT_NODE) &&
    (child->type != XML_CDATA_SECTION_NODE))
      {
    xsltTransformError(NULL, cctxt->style, elem,
        "The XSLT 'text' element must have only character "
        "data as content.\n");
      }
      child = child->next;
  } while (child != NULL);
    }
    goto exit;

empty_content:
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  /*
  * Relaxed behaviour: we will allow whitespace-only text-nodes.
  */
  do {
      if (((child->type != XML_TEXT_NODE) &&
     (child->type != XML_CDATA_SECTION_NODE)) ||
    (! IS_BLANK_NODE(child)))
      {
    xsltTransformError(NULL, cctxt->style, elem,
        "This XSLT element must have no content.\n");
    cctxt->style->errors++;
    break;
      }
      child = child->next;
  } while (child != NULL);
    }
    goto exit;

choose:
    /* <!-- Content: (xsl:when+, xsl:otherwise?) --> */
    /*
    * TODO: text-nodes in between are *not* allowed in XSLT 1.0.
    *   The old behaviour did not check this.
    * NOTE: In XSLT 2.0 they are stripped beforehand
    *  if whitespace-only (regardless of xml:space).
    */
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  int nbWhen = 0, nbOtherwise = 0, err = 0;
  do {
      if (child->type == XML_ELEMENT_NODE) {
    if (IS_XSLT_ELEM_FAST(child)) {
        xsltStyleType type;

        type = xsltGetXSLTElementTypeByNode(cctxt, child);
        if (type == XSLT_FUNC_WHEN) {
      nbWhen++;
      if (nbOtherwise) {
          xsltParseContentError(cctxt->style, child);
          err = 1;
          break;
      }
      cctxt->inode->curChildType = XSLT_FUNC_WHEN;
      xsltParseAnyXSLTElem(cctxt, child);
        } else if (type == XSLT_FUNC_OTHERWISE) {
      if (! nbWhen) {
          xsltParseContentError(cctxt->style, child);
          err = 1;
          break;
      }
      if (nbOtherwise) {
          xsltTransformError(NULL, cctxt->style, elem,
        "The XSLT 'choose' element must not contain "
        "more than one XSLT 'otherwise' element.\n");
          cctxt->style->errors++;
          err = 1;
          break;
      }
      nbOtherwise++;
      cctxt->inode->curChildType = XSLT_FUNC_OTHERWISE;
      xsltParseAnyXSLTElem(cctxt, child);
        } else
      xsltParseContentError(cctxt->style, child);
    } else
        xsltParseContentError(cctxt->style, child);
      }
      /*
    else
        xsltParseContentError(cctxt, child);
      */
      child = child->next;
  } while (child != NULL);
  if ((! err) && (! nbWhen)) {
      xsltTransformError(NULL, cctxt->style, elem,
    "The XSLT element 'choose' must contain at least one "
    "XSLT element 'when'.\n");
    cctxt->style->errors++;
  }
    }
    goto exit;

for_each:
    /* <!-- Content: (xsl:sort*, template) --> */
    /*
    * NOTE: Text-nodes before xsl:sort are *not* allowed in XSLT 1.0.
    *   The old behaviour did not allow this, but it catched this
    *   only at transformation-time.
    *   In XSLT 2.0 they are stripped beforehand if whitespace-only
    *   (regardless of xml:space).
    */
    if (elem->children != NULL) {
  xmlNodePtr child = elem->children;
  /*
  * Parse xsl:sort first.
  */
  do {
      if ((child->type == XML_ELEMENT_NODE) &&
    IS_XSLT_ELEM_FAST(child))
      {
    if (xsltGetXSLTElementTypeByNode(cctxt, child) ==
        XSLT_FUNC_SORT)
    {
        cctxt->inode->curChildType = XSLT_FUNC_SORT;
        xsltParseAnyXSLTElem(cctxt, child);
    } else
        break;
      } else
    break;
      child = child->next;
  } while (child != NULL);
  /*
  * Parse the sequece constructor.
  */
  if (child != NULL)
      xsltParseSequenceConstructor(cctxt, child);
    }
    goto exit;

sequence_constructor:
    /*
    * Parse the sequence constructor.
    */
    if (elem->children != NULL)
  xsltParseSequenceConstructor(cctxt, elem->children);

    /*
    * Register information for vars/params. Only needed if there
    * are any following siblings.
    */
    if ((elem->next != NULL) &&
  ((cctxt->inode->type == XSLT_FUNC_VARIABLE) ||
   (cctxt->inode->type == XSLT_FUNC_PARAM)))
    {
  if ((elem->psvi != NULL) &&
      (((xsltStyleBasicItemVariablePtr) elem->psvi)->name))
  {
      xsltCompilerVarInfoPush(cctxt, elem,
    ((xsltStyleBasicItemVariablePtr) elem->psvi)->name,
    ((xsltStyleBasicItemVariablePtr) elem->psvi)->ns);
  }
    }

error:
exit:
    xsltCompilerNodePop(cctxt, elem);
    return(0);

internal_err:
    xsltCompilerNodePop(cctxt, elem);
    return(-1);
}

/**
 * xsltForwardsCompatUnkownItemCreate:
 *
 * @cctxt: the compilation context
 *
 * Creates a compiled representation of the unknown
 * XSLT instruction.
 *
 * Returns the compiled representation.
 */
static xsltStyleItemUknownPtr
xsltForwardsCompatUnkownItemCreate(xsltCompilerCtxtPtr cctxt)
{
    xsltStyleItemUknownPtr item;

    item = (xsltStyleItemUknownPtr) xmlMalloc(sizeof(xsltStyleItemUknown));
    if (item == NULL) {
  xsltTransformError(NULL, cctxt->style, NULL,
      "Internal error in xsltForwardsCompatUnkownItemCreate(): "
      "Failed to allocate memory.\n");
  cctxt->style->errors++;
  return(NULL);
    }
    memset(item, 0, sizeof(xsltStyleItemUknown));
    item->type = XSLT_FUNC_UNKOWN_FORWARDS_COMPAT;
    /*
    * Store it in the stylesheet.
    */
    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;
    return(item);
}

/**
 * xsltParseUnknownXSLTElem:
 *
 * @cctxt: the compilation context
 * @node: the element of the unknown XSLT instruction
 *
 * Parses an unknown XSLT element.
 * If forwards compatible mode is enabled this will allow
 * such an unknown XSLT and; otherwise it is rejected.
 *
 * Returns 1 in the unknown XSLT instruction is rejected,
 *         0 if everything's fine and
 *         -1 on API or internal errors.
 */
static int
xsltParseUnknownXSLTElem(xsltCompilerCtxtPtr cctxt,
          xmlNodePtr node)
{
    if ((cctxt == NULL) || (node == NULL) || (node->type != XML_ELEMENT_NODE))
  return(-1);

    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
  cctxt->inode->extContentHandled = 1;
    }
    if (cctxt->inode->forwardsCompat == 0) {
  /*
  * We are not in forwards-compatible mode, so raise an error.
  */
  xsltTransformError(NULL, cctxt->style, node,
      "Unknown XSLT element '%s'.\n", node->name);
  cctxt->style->errors++;
  return(1);
    }
    /*
    * Forwards-compatible mode.
    * ------------------------
    *
    * Parse/compile xsl:fallback elements.
    *
    * QUESTION: Do we have to raise an error if there's no xsl:fallback?
    * ANSWER: No, since in the stylesheet the fallback behaviour might
    *  also be provided by using the XSLT function "element-available".
    */
    if (cctxt->unknownItem == NULL) {
  /*
  * Create a singleton for all unknown XSLT instructions.
  */
  cctxt->unknownItem = xsltForwardsCompatUnkownItemCreate(cctxt);
  if (cctxt->unknownItem == NULL) {
      node->psvi = NULL;
      return(-1);
  }
    }
    node->psvi = cctxt->unknownItem;
    if (node->children == NULL)
  return(0);
    else {
  xmlNodePtr child = node->children;

  xsltCompilerNodePush(cctxt, node);
  /*
  * Update the in-scope namespaces if needed.
  */
  if (node->nsDef != NULL)
      cctxt->inode->inScopeNs =
    xsltCompilerBuildInScopeNsList(cctxt, node);
  /*
  * Parse all xsl:fallback children.
  */
  do {
      if ((child->type == XML_ELEMENT_NODE) &&
    IS_XSLT_ELEM_FAST(child) &&
    IS_XSLT_NAME(child, "fallback"))
      {
    cctxt->inode->curChildType = XSLT_FUNC_FALLBACK;
    xsltParseAnyXSLTElem(cctxt, child);
      }
      child = child->next;
  } while (child != NULL);

  xsltCompilerNodePop(cctxt, node);
    }
    return(0);
}

/**
 * xsltParseSequenceConstructor:
 *
 * @cctxt: the compilation context
 * @cur: the start-node of the content to be parsed
 *
 * Parses a "template" content (or "sequence constructor" in XSLT 2.0 terms).
 * This will additionally remove xsl:text elements from the tree.
 */
void
xsltParseSequenceConstructor(xsltCompilerCtxtPtr cctxt, xmlNodePtr cur)
{
    xsltStyleType type;
    xmlNodePtr deleteNode = NULL;

    if (cctxt == NULL) {
  xmlGenericError(xmlGenericErrorContext,
      "xsltParseSequenceConstructor: Bad arguments\n");
  cctxt->style->errors++;
  return;
    }
    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
  cctxt->inode->extContentHandled = 1;
    }
    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
  return;
    /*
    * This is the content reffered to as a "template".
    * E.g. an xsl:element has such content model:
    * <xsl:element
    *   name = { qname }
    *   namespace = { uri-reference }
    *   use-attribute-sets = qnames>
    * <!-- Content: template -->
    *
    * NOTE that in XSLT-2 the term "template" was abandoned due to
    *  confusion with xsl:template and the term "sequence constructor"
    *  was introduced instead.
    *
    * The following XSLT-instructions are allowed to appear:
    *  xsl:apply-templates, xsl:call-template, xsl:apply-imports,
    *  xsl:for-each, xsl:value-of, xsl:copy-of, xsl:number,
    *  xsl:choose, xsl:if, xsl:text, xsl:copy, xsl:variable,
    *  xsl:message, xsl:fallback,
    *  xsl:processing-instruction, xsl:comment, xsl:element
    *  xsl:attribute.
    * Additional allowed content:
    * 1) extension instructions
    * 2) literal result elements
    * 3) PCDATA
    *
    * NOTE that this content model does *not* allow xsl:param.
    */
    while (cur != NULL) {
  if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
      xsltGenericDebug(xsltGenericDebugContext,
       "xsltParseSequenceConstructor: removing xsl:text element\n");
#endif
      xmlUnlinkNode(deleteNode);
      xmlFreeNode(deleteNode);
      deleteNode = NULL;
  }
  if (cur->type == XML_ELEMENT_NODE) {

      if (cur->psvi == xsltXSLTTextMarker) {
    /*
    * xsl:text elements
    * --------------------------------------------------------
    */
    xmlNodePtr tmp;

    cur->psvi = NULL;
    /*
    * Mark the xsl:text element for later deletion.
    */
    deleteNode = cur;
    /*
    * Validate content.
    */
    tmp = cur->children;
    if (tmp) {
        /*
        * We don't expect more than one text-node in the
        * content, since we already merged adjacent
        * text/CDATA-nodes and eliminated PI/comment-nodes.
        */
        if ((tmp->type == XML_TEXT_NODE) ||
      (tmp->next == NULL))
        {
      /*
      * Leave the contained text-node in the tree.
      */
      xmlUnlinkNode(tmp);
      xmlAddPrevSibling(cur, tmp);
        } else {
      tmp = NULL;
      xsltTransformError(NULL, cctxt->style, cur,
          "Element 'xsl:text': Invalid type "
          "of node found in content.\n");
      cctxt->style->errors++;
        }
    }
    if (cur->properties) {
        xmlAttrPtr attr;
        /*
        * TODO: We need to report errors for
        *  invalid attrs.
        */
        attr = cur->properties;
        do {
      if ((attr->ns == NULL) &&
          (attr->name != NULL) &&
          (attr->name[0] == 'd') &&
          xmlStrEqual(attr->name,
          BAD_CAST "disable-output-escaping"))
      {
          /*
          * Attr "disable-output-escaping".
          * XSLT-2: This attribute is deprecated.
          */
          if ((attr->children != NULL) &&
        xmlStrEqual(attr->children->content,
        BAD_CAST "yes"))
          {
        /*
        * Disable output escaping for this
        * text node.
        */
        if (tmp)
            tmp->name = xmlStringTextNoenc;
          } else if ((attr->children == NULL) ||
        (attr->children->content == NULL) ||
        (!xmlStrEqual(attr->children->content,
        BAD_CAST "no")))
          {
        xsltTransformError(NULL, cctxt->style,
            cur,
            "Attribute 'disable-output-escaping': "
            "Invalid value. Expected is "
            "'yes' or 'no'.\n");
        cctxt->style->errors++;
          }
          break;
      }
      attr = attr->next;
        } while (attr != NULL);
    }
      } else if (IS_XSLT_ELEM_FAST(cur)) {
    /*
    * TODO: Using the XSLT-marker is still not stable yet.
    */
    /* if (cur->psvi == xsltXSLTElemMarker) { */
    /*
    * XSLT instructions
    * --------------------------------------------------------
    */
    cur->psvi = NULL;
    type = xsltGetXSLTElementTypeByNode(cctxt, cur);
    switch (type) {
        case XSLT_FUNC_APPLYIMPORTS:
        case XSLT_FUNC_APPLYTEMPLATES:
        case XSLT_FUNC_ATTRIBUTE:
        case XSLT_FUNC_CALLTEMPLATE:
        case XSLT_FUNC_CHOOSE:
        case XSLT_FUNC_COMMENT:
        case XSLT_FUNC_COPY:
        case XSLT_FUNC_COPYOF:
        case XSLT_FUNC_DOCUMENT: /* Extra one */
        case XSLT_FUNC_ELEMENT:
        case XSLT_FUNC_FALLBACK:
        case XSLT_FUNC_FOREACH:
        case XSLT_FUNC_IF:
        case XSLT_FUNC_MESSAGE:
        case XSLT_FUNC_NUMBER:
        case XSLT_FUNC_PI:
        case XSLT_FUNC_TEXT:
        case XSLT_FUNC_VALUEOF:
        case XSLT_FUNC_VARIABLE:
      /*
      * Parse the XSLT element.
      */
      cctxt->inode->curChildType = type;
      xsltParseAnyXSLTElem(cctxt, cur);
      break;
        default:
      xsltParseUnknownXSLTElem(cctxt, cur);
      cur = cur->next;
      continue;
    }
      } else {
    /*
    * Non-XSLT elements
    * -----------------
    */
    xsltCompilerNodePush(cctxt, cur);
    /*
    * Update the in-scope namespaces if needed.
    */
    if (cur->nsDef != NULL)
        cctxt->inode->inScopeNs =
      xsltCompilerBuildInScopeNsList(cctxt, cur);
    /*
    * The current element is either a literal result element
    * or an extension instruction.
    *
    * Process attr "xsl:extension-element-prefixes".
    * FUTURE TODO: IIRC in XSLT 2.0 this attribute must be
    * processed by the implementor of the extension function;
    * i.e., it won't be handled by the XSLT processor.
    */
    /* SPEC 1.0:
    *   "exclude-result-prefixes" is only allowed on literal
    *   result elements and "xsl:exclude-result-prefixes"
    *   on xsl:stylesheet/xsl:transform.
    * SPEC 2.0:
    *   "There are a number of standard attributes
    *   that may appear on any XSLT element: specifically
    *   version, exclude-result-prefixes,
    *   extension-element-prefixes, xpath-default-namespace,
    *   default-collation, and use-when."
    *
    * SPEC 2.0:
    *   For literal result elements:
    *   "xsl:version, xsl:exclude-result-prefixes,
    *    xsl:extension-element-prefixes,
    *    xsl:xpath-default-namespace,
    *    xsl:default-collation, or xsl:use-when."
    */
    if (cur->properties)
        cctxt->inode->extElemNs =
      xsltParseExtElemPrefixes(cctxt,
          cur, cctxt->inode->extElemNs,
          XSLT_ELEMENT_CATEGORY_LRE);
    /*
    * Eval if we have an extension instruction here.
    */
    if ((cur->ns != NULL) &&
        (cctxt->inode->extElemNs != NULL) &&
        (xsltCheckExtPrefix(cctxt->style, cur->ns->href) == 1))
    {
        /*
        * Extension instructions
        * ----------------------------------------------------
        * Mark the node information.
        */
        cctxt->inode->category = XSLT_ELEMENT_CATEGORY_EXTENSION;
        cctxt->inode->extContentHandled = 0;
        if (cur->psvi != NULL) {
      cur->psvi = NULL;
      /*
      * TODO: Temporary sanity check.
      */
      xsltTransformError(NULL, cctxt->style, cur,
          "Internal error in xsltParseSequenceConstructor(): "
          "Occupied PSVI field.\n");
      cctxt->style->errors++;
      cur = cur->next;
      continue;
        }
        cur->psvi = (void *)
      xsltPreComputeExtModuleElement(cctxt->style, cur);

        if (cur->psvi == NULL) {
      /*
      * OLD COMMENT: "Unknown element, maybe registered
      *  at the context level. Mark it for later
      *  recognition."
      * QUESTION: What does the xsltExtMarker mean?
      *  ANSWER: It is used in
      *   xsltApplySequenceConstructor() at
      *   transformation-time to look out for extension
      *   registered in the transformation context.
      */
      cur->psvi = (void *) xsltExtMarker;
        }
        /*
        * BIG NOTE: Now the ugly part. In previous versions
        *  of Libxslt (until 1.1.16), all the content of an
        *  extension instruction was processed and compiled without
        *  the need of the extension-author to explicitely call
        *  such a processing;.We now need to mimic this old
        *  behaviour in order to avoid breaking old code
        *  on the extension-author's side.
        * The mechanism:
        *  1) If the author does *not* set the
        *    compile-time-flag @extContentHandled, then we'll
        *    parse the content assuming that it's a "template"
        *    (or "sequence constructor in XSLT 2.0 terms).
        *    NOTE: If the extension is registered at
        *    transformation-time only, then there's no way of
        *    knowing that content shall be valid, and we'll
        *    process the content the same way.
        *  2) If the author *does* set the flag, then we'll assume
        *   that the author has handled the parsing him/herself
        *   (e.g. called xsltParseSequenceConstructor(), etc.
        *   explicitely in his/her code).
        */
        if ((cur->children != NULL) &&
      (cctxt->inode->extContentHandled == 0))
        {
      /*
      * Default parsing of the content using the
      * sequence-constructor model.
      */
      xsltParseSequenceConstructor(cctxt, cur->children);
        }
    } else {
        /*
        * Literal result element
        * ----------------------------------------------------
        * Allowed XSLT attributes:
        *  xsl:extension-element-prefixes CDATA #IMPLIED
        *  xsl:exclude-result-prefixes CDATA #IMPLIED
        *  TODO: xsl:use-attribute-sets %qnames; #IMPLIED
        *  xsl:version NMTOKEN #IMPLIED
        */
        cur->psvi = NULL;
        cctxt->inode->category = XSLT_ELEMENT_CATEGORY_LRE;
        if (cur->properties != NULL) {
      xmlAttrPtr attr = cur->properties;
      /*
      * Attribute "xsl:exclude-result-prefixes".
      */
      cctxt->inode->exclResultNs =
          xsltParseExclResultPrefixes(cctxt, cur,
        cctxt->inode->exclResultNs,
        XSLT_ELEMENT_CATEGORY_LRE);
      /*
      * Attribute "xsl:version".
      */
      xsltParseAttrXSLTVersion(cctxt, cur,
          XSLT_ELEMENT_CATEGORY_LRE);
      /*
      * Report invalid XSLT attributes.
      * For XSLT 1.0 only xsl:use-attribute-sets is allowed
      * next to xsl:version, xsl:exclude-result-prefixes and
      * xsl:extension-element-prefixes.
      *
      * Mark all XSLT attributes, in order to skip such
      * attributes when instantiating the LRE.
      */
      do {
          if ((attr->psvi != xsltXSLTAttrMarker) &&
        IS_XSLT_ATTR_FAST(attr))
          {
        if (! xmlStrEqual(attr->name,
            BAD_CAST "use-attribute-sets"))
        {
            xsltTransformError(NULL, cctxt->style,
          cur,
          "Unknown XSLT attribute '%s'.\n",
          attr->name);
            cctxt->style->errors++;
        } else {
            /*
            * XSLT attr marker.
            */
            attr->psvi = (void *) xsltXSLTAttrMarker;
        }
          }
          attr = attr->next;
      } while (attr != NULL);
        }
        /*
        * Create/reuse info for the literal result element.
        */
        if (cctxt->inode->nsChanged)
      xsltLREInfoCreate(cctxt, cur, 1);
        cur->psvi = cctxt->inode->litResElemInfo;
        /*
        * Apply ns-aliasing on the element and on its attributes.
        */
        if (cctxt->hasNsAliases)
      xsltLREBuildEffectiveNs(cctxt, cur);
        /*
        * Compile attribute value templates (AVT).
        */
        if (cur->properties) {
      xmlAttrPtr attr = cur->properties;

      while (attr != NULL) {
          xsltCompileAttr(cctxt->style, attr);
          attr = attr->next;
      }
        }
        /*
        * Parse the content, which is defined to be a "template"
        * (or "sequence constructor" in XSLT 2.0 terms).
        */
        if (cur->children != NULL) {
      xsltParseSequenceConstructor(cctxt, cur->children);
        }
    }
    /*
    * Leave the non-XSLT element.
    */
    xsltCompilerNodePop(cctxt, cur);
      }
  }
  cur = cur->next;
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
  xsltGenericDebug(xsltGenericDebugContext,
      "xsltParseSequenceConstructor: removing xsl:text element\n");
#endif
  xmlUnlinkNode(deleteNode);
  xmlFreeNode(deleteNode);
  deleteNode = NULL;
    }
}

/**
 * xsltParseTemplateContent:
 * @style:  the XSLT stylesheet
 * @templ:  the node containing the content to be parsed
 *
 * Parses and compiles the content-model of an xsl:template element.
 * Note that this is *not* the "template" content model (or "sequence
 *  constructor" in XSLT 2.0); it it allows addional xsl:param
 *  elements as immediate children of @templ.
 *
 * Called by:
 *   exsltFuncFunctionComp() (EXSLT, functions.c)
 *   So this is intended to be called from extension functions.
 */
void
xsltParseTemplateContent(xsltStylesheetPtr style, xmlNodePtr templ) {
    if ((style == NULL) || (templ == NULL) ||
        (templ->type == XML_NAMESPACE_DECL))
  return;

    /*
    * Detection of handled content of extension instructions.
    */
    if (XSLT_CCTXT(style)->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
  XSLT_CCTXT(style)->inode->extContentHandled = 1;
    }

    if (templ->children != NULL) {
  xmlNodePtr child = templ->children;
  /*
  * Process xsl:param elements, which can only occur as the
  * immediate children of xsl:template (well, and of any
  * user-defined extension instruction if needed).
  */
  do {
      if ((child->type == XML_ELEMENT_NODE) &&
    IS_XSLT_ELEM_FAST(child) &&
    IS_XSLT_NAME(child, "param"))
      {
    XSLT_CCTXT(style)->inode->curChildType = XSLT_FUNC_PARAM;
    xsltParseAnyXSLTElem(XSLT_CCTXT(style), child);
      } else
    break;
      child = child->next;
  } while (child != NULL);
  /*
  * Parse the content and register the pattern.
  */
  xsltParseSequenceConstructor(XSLT_CCTXT(style), child);
    }
}

#else /* XSLT_REFACTORED */

/**
 * xsltParseTemplateContent:
 * @style:  the XSLT stylesheet
 * @templ:  the container node (can be a document for literal results)
 *
 * parse a template content-model
 * Clean-up the template content from unwanted ignorable blank nodes
 * and process xslt:text
 */
void
xsltParseTemplateContent(xsltStylesheetPtr style, xmlNodePtr templ) {
    xmlNodePtr cur, delete;

    if ((style == NULL) || (templ == NULL) ||
        (templ->type == XML_NAMESPACE_DECL)) return;

    /*
     * This content comes from the stylesheet
     * For stylesheets, the set of whitespace-preserving
     * element names consists of just xsl:text.
     */
    cur = templ->children;
    delete = NULL;
    while (cur != NULL) {
  if (delete != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
      xsltGenericDebug(xsltGenericDebugContext,
       "xsltParseTemplateContent: removing text\n");
#endif
      xmlUnlinkNode(delete);
      xmlFreeNode(delete);
      delete = NULL;
  }
  if (IS_XSLT_ELEM(cur)) {
            xsltStylePreCompute(style, cur);

      if (IS_XSLT_NAME(cur, "text")) {
    /*
    * TODO: Processing of xsl:text should be moved to
    *   xsltPreprocessStylesheet(), since otherwise this
    *   will be performed for every multiply included
    *   stylesheet; i.e. this here is not skipped with
    *   the use of the style->nopreproc flag.
    */
    if (cur->children != NULL) {
        xmlChar *prop;
        xmlNodePtr text = cur->children, next;
        int noesc = 0;

        prop = xmlGetNsProp(cur,
      (const xmlChar *)"disable-output-escaping",
      NULL);
        if (prop != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
           "Disable escaping: %s\n", text->content);
#endif
      if (xmlStrEqual(prop, (const xmlChar *)"yes")) {
          noesc = 1;
      } else if (!xmlStrEqual(prop,
            (const xmlChar *)"no")){
          xsltTransformError(NULL, style, cur,
       "xsl:text: disable-output-escaping allows only yes or no\n");
          style->warnings++;

      }
      xmlFree(prop);
        }

        while (text != NULL) {
      if (text->type == XML_COMMENT_NODE) {
          text = text->next;
          continue;
      }
      if ((text->type != XML_TEXT_NODE) &&
           (text->type != XML_CDATA_SECTION_NODE)) {
          xsltTransformError(NULL, style, cur,
     "xsltParseTemplateContent: xslt:text content problem\n");
          style->errors++;
          break;
      }
      if ((noesc) && (text->type != XML_CDATA_SECTION_NODE))
          text->name = xmlStringTextNoenc;
      text = text->next;
        }

        /*
         * replace xsl:text by the list of childs
         */
        if (text == NULL) {
      text = cur->children;
      while (text != NULL) {
          if ((style->internalized) &&
              (text->content != NULL) &&
              (!xmlDictOwns(style->dict, text->content))) {

        /*
         * internalize the text string
         */
        if (text->doc->dict != NULL) {
            const xmlChar *tmp;

            tmp = xmlDictLookup(text->doc->dict,
                                text->content, -1);
            if (tmp != text->content) {
                xmlNodeSetContent(text, NULL);
          text->content = (xmlChar *) tmp;
            }
        }
          }

          next = text->next;
          xmlUnlinkNode(text);
          xmlAddPrevSibling(cur, text);
          text = next;
      }
        }
    }
    delete = cur;
    goto skip_children;
      }
  }
  else if ((cur->ns != NULL) && (style->nsDefs != NULL) &&
      (xsltCheckExtPrefix(style, cur->ns->prefix)))
  {
      /*
       * okay this is an extension element compile it too
       */
      xsltStylePreCompute(style, cur);
  }
  else if (cur->type == XML_ELEMENT_NODE)
  {
      /*
       * This is an element which will be output as part of the
       * template exectution, precompile AVT if found.
       */
      if ((cur->ns == NULL) && (style->defaultAlias != NULL)) {
    cur->ns = xmlSearchNsByHref(cur->doc, cur,
      style->defaultAlias);
      }
      if (cur->properties != NULL) {
          xmlAttrPtr attr = cur->properties;

    while (attr != NULL) {
        xsltCompileAttr(style, attr);
        attr = attr->next;
    }
      }
  }
  /*
   * Skip to next node
   */
  if (cur->children != NULL) {
      if (cur->children->type != XML_ENTITY_DECL) {
    cur = cur->children;
    continue;
      }
  }
skip_children:
  if (cur->next != NULL) {
      cur = cur->next;
      continue;
  }

  do {
      cur = cur->parent;
      if (cur == NULL)
    break;
      if (cur == templ) {
    cur = NULL;
    break;
      }
      if (cur->next != NULL) {
    cur = cur->next;
    break;
      }
  } while (cur != NULL);
    }
    if (delete != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
   "xsltParseTemplateContent: removing text\n");
#endif
  xmlUnlinkNode(delete);
  xmlFreeNode(delete);
  delete = NULL;
    }

    /*
     * Skip the first params
     */
    cur = templ->children;
    while (cur != NULL) {
  if ((IS_XSLT_ELEM(cur)) && (!(IS_XSLT_NAME(cur, "param"))))
      break;
  cur = cur->next;
    }

    /*
     * Browse the remainder of the template
     */
    while (cur != NULL) {
  if ((IS_XSLT_ELEM(cur)) && (IS_XSLT_NAME(cur, "param"))) {
      xmlNodePtr param = cur;

      xsltTransformError(NULL, style, cur,
    "xsltParseTemplateContent: ignoring misplaced param element\n");
      if (style != NULL) style->warnings++;
            cur = cur->next;
      xmlUnlinkNode(param);
      xmlFreeNode(param);
  } else
      break;
    }
}

#endif /* else XSLT_REFACTORED */

/**
 * xsltParseStylesheetKey:
 * @style:  the XSLT stylesheet
 * @key:  the "key" element
 *
 * <!-- Category: top-level-element -->
 * <xsl:key name = qname, match = pattern, use = expression />
 *
 * parse an XSLT stylesheet key definition and register it
 */

static void
xsltParseStylesheetKey(xsltStylesheetPtr style, xmlNodePtr key) {
    xmlChar *prop = NULL;
    xmlChar *use = NULL;
    xmlChar *match = NULL;
    xmlChar *name = NULL;
    xmlChar *nameURI = NULL;

    if ((style == NULL) || (key == NULL) || (key->type != XML_ELEMENT_NODE))
  return;

    /*
     * Get arguments
     */
    prop = xmlGetNsProp(key, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

  /*
  * TODO: Don't use xsltGetQNameURI().
  */
  URI = xsltGetQNameURI(key, &prop);
  if (prop == NULL) {
      if (style != NULL) style->errors++;
      goto error;
  } else {
      name = prop;
      if (URI != NULL)
    nameURI = xmlStrdup(URI);
  }
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
       "xsltParseStylesheetKey: name %s\n", name);
#endif
    } else {
  xsltTransformError(NULL, style, key,
      "xsl:key : error missing name\n");
  if (style != NULL) style->errors++;
  goto error;
    }

    match = xmlGetNsProp(key, (const xmlChar *)"match", NULL);
    if (match == NULL) {
  xsltTransformError(NULL, style, key,
      "xsl:key : error missing match\n");
  if (style != NULL) style->errors++;
  goto error;
    }

    use = xmlGetNsProp(key, (const xmlChar *)"use", NULL);
    if (use == NULL) {
  xsltTransformError(NULL, style, key,
      "xsl:key : error missing use\n");
  if (style != NULL) style->errors++;
  goto error;
    }

    /*
     * register the keys
     */
    xsltAddKey(style, name, nameURI, match, use, key);


error:
    if (use != NULL)
  xmlFree(use);
    if (match != NULL)
  xmlFree(match);
    if (name != NULL)
  xmlFree(name);
    if (nameURI != NULL)
  xmlFree(nameURI);

    if (key->children != NULL) {
  xsltParseContentError(style, key->children);
    }
}

#ifdef XSLT_REFACTORED
/**
 * xsltParseXSLTTemplate:
 * @style:  the XSLT stylesheet
 * @template:  the "template" element
 *
 * parse an XSLT stylesheet template building the associated structures
 * TODO: Is @style ever expected to be NULL?
 *
 * Called from:
 *   xsltParseXSLTStylesheet()
 *   xsltParseStylesheetTop()
 */

static void
xsltParseXSLTTemplate(xsltCompilerCtxtPtr cctxt, xmlNodePtr templNode) {
    xsltTemplatePtr templ;
    xmlChar *prop;
    double  priority;

    if ((cctxt == NULL) || (templNode == NULL) ||
        (templNode->type != XML_ELEMENT_NODE))
  return;

    /*
     * Create and link the structure
     */
    templ = xsltNewTemplate();
    if (templ == NULL)
  return;

    xsltCompilerNodePush(cctxt, templNode);
    if (templNode->nsDef != NULL)
  cctxt->inode->inScopeNs =
      xsltCompilerBuildInScopeNsList(cctxt, templNode);

    templ->next = cctxt->style->templates;
    cctxt->style->templates = templ;
    templ->style = cctxt->style;

    /*
    * Attribute "mode".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"mode", NULL);
    if (prop != NULL) {
        const xmlChar *modeURI;

  /*
  * TODO: We need a standardized function for extraction
  *  of namespace names and local names from QNames.
  *  Don't use xsltGetQNameURI() as it cannot channe�
  *  reports through the context.
  */
  modeURI = xsltGetQNameURI(templNode, &prop);
  if (prop == NULL) {
      cctxt->style->errors++;
      goto error;
  }
  templ->mode = xmlDictLookup(cctxt->style->dict, prop, -1);
  xmlFree(prop);
  prop = NULL;
  if (xmlValidateNCName(templ->mode, 0)) {
      xsltTransformError(NULL, cctxt->style, templNode,
    "xsl:template: Attribute 'mode': The local part '%s' "
    "of the value is not a valid NCName.\n", templ->name);
      cctxt->style->errors++;
      goto error;
  }
  if (modeURI != NULL)
      templ->modeURI = xmlDictLookup(cctxt->style->dict, modeURI, -1);
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
       "xsltParseXSLTTemplate: mode %s\n", templ->mode);
#endif
    }
    /*
    * Attribute "match".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"match", NULL);
    if (prop != NULL) {
  templ->match  = prop;
  prop = NULL;
    }
    /*
    * Attribute "priority".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"priority", NULL);
    if (prop != NULL) {
  priority = xmlXPathStringEvalNumber(prop);
  templ->priority = (float) priority;
  xmlFree(prop);
  prop = NULL;
    }
    /*
    * Attribute "name".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *nameURI;
  xsltTemplatePtr curTempl;

  /*
  * TODO: Don't use xsltGetQNameURI().
  */
  nameURI = xsltGetQNameURI(templNode, &prop);
  if (prop == NULL) {
      cctxt->style->errors++;
      goto error;
  }
  templ->name = xmlDictLookup(cctxt->style->dict, prop, -1);
  xmlFree(prop);
  prop = NULL;
  if (xmlValidateNCName(templ->name, 0)) {
      xsltTransformError(NULL, cctxt->style, templNode,
    "xsl:template: Attribute 'name': The local part '%s' of "
    "the value is not a valid NCName.\n", templ->name);
      cctxt->style->errors++;
      goto error;
  }
  if (nameURI != NULL)
      templ->nameURI = xmlDictLookup(cctxt->style->dict, nameURI, -1);
  curTempl = templ->next;
  while (curTempl != NULL) {
      if ((nameURI != NULL && xmlStrEqual(curTempl->name, templ->name) &&
    xmlStrEqual(curTempl->nameURI, nameURI) ) ||
    (nameURI == NULL && curTempl->nameURI == NULL &&
    xmlStrEqual(curTempl->name, templ->name)))
      {
    xsltTransformError(NULL, cctxt->style, templNode,
        "xsl:template: error duplicate name '%s'\n", templ->name);
    cctxt->style->errors++;
    goto error;
      }
      curTempl = curTempl->next;
  }
    }
    if (templNode->children != NULL) {
  xsltParseTemplateContent(cctxt->style, templNode);
  /*
  * MAYBE TODO: Custom behaviour: In order to stay compatible with
  * Xalan and MSXML(.NET), we could allow whitespace
  * to appear before an xml:param element; this whitespace
  * will additionally become part of the "template".
  * NOTE that this is totally deviates from the spec, but
  * is the de facto behaviour of Xalan and MSXML(.NET).
  * Personally I wouldn't allow this, since if we have:
  * <xsl:template ...xml:space="preserve">
  *   <xsl:param name="foo"/>
  *   <xsl:param name="bar"/>
  *   <xsl:param name="zoo"/>
  * ... the whitespace between every xsl:param would be
  * added to the result tree.
  */
    }

    templ->elem = templNode;
    templ->content = templNode->children;
    xsltAddTemplate(cctxt->style, templ, templ->mode, templ->modeURI);

error:
    xsltCompilerNodePop(cctxt, templNode);
    return;
}

#else /* XSLT_REFACTORED */

/**
 * xsltParseStylesheetTemplate:
 * @style:  the XSLT stylesheet
 * @template:  the "template" element
 *
 * parse an XSLT stylesheet template building the associated structures
 */

static void
xsltParseStylesheetTemplate(xsltStylesheetPtr style, xmlNodePtr template) {
    xsltTemplatePtr ret;
    xmlChar *prop;
    xmlChar *mode = NULL;
    xmlChar *modeURI = NULL;
    double  priority;

    if ((style == NULL) || (template == NULL) ||
        (template->type != XML_ELEMENT_NODE))
  return;

    /*
     * Create and link the structure
     */
    ret = xsltNewTemplate();
    if (ret == NULL)
  return;
    ret->next = style->templates;
    style->templates = ret;
    ret->style = style;

    /*
     * Get inherited namespaces
     */
    /*
    * TODO: Apply the optimized in-scope-namespace mechanism
    *   as for the other XSLT instructions.
    */
    xsltGetInheritedNsList(style, ret, template);

    /*
     * Get arguments
     */
    prop = xmlGetNsProp(template, (const xmlChar *)"mode", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

  /*
  * TODO: Don't use xsltGetQNameURI().
  */
  URI = xsltGetQNameURI(template, &prop);
  if (prop == NULL) {
      if (style != NULL) style->errors++;
      goto error;
  } else {
      mode = prop;
      if (URI != NULL)
    modeURI = xmlStrdup(URI);
  }
  ret->mode = xmlDictLookup(style->dict, mode, -1);
  ret->modeURI = xmlDictLookup(style->dict, modeURI, -1);
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
       "xsltParseStylesheetTemplate: mode %s\n", mode);
#endif
        if (mode != NULL) xmlFree(mode);
  if (modeURI != NULL) xmlFree(modeURI);
    }
    prop = xmlGetNsProp(template, (const xmlChar *)"match", NULL);
    if (prop != NULL) {
  if (ret->match != NULL) xmlFree(ret->match);
  ret->match  = prop;
    }

    prop = xmlGetNsProp(template, (const xmlChar *)"priority", NULL);
    if (prop != NULL) {
  priority = xmlXPathStringEvalNumber(prop);
  ret->priority = (float) priority;
  xmlFree(prop);
    }

    prop = xmlGetNsProp(template, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

  /*
  * TODO: Don't use xsltGetQNameURI().
  */
  URI = xsltGetQNameURI(template, &prop);
  if (prop == NULL) {
      if (style != NULL) style->errors++;
      goto error;
  } else {
      if (xmlValidateNCName(prop,0)) {
          xsltTransformError(NULL, style, template,
              "xsl:template : error invalid name '%s'\n", prop);
    if (style != NULL) style->errors++;
                xmlFree(prop);
    goto error;
      }
      ret->name = xmlDictLookup(style->dict, BAD_CAST prop, -1);
      xmlFree(prop);
      prop = NULL;
      if (URI != NULL)
    ret->nameURI = xmlDictLookup(style->dict, BAD_CAST URI, -1);
      else
    ret->nameURI = NULL;
  }
    }

    /*
     * parse the content and register the pattern
     */
    xsltParseTemplateContent(style, template);
    ret->elem = template;
    ret->content = template->children;
    xsltAddTemplate(style, ret, ret->mode, ret->modeURI);

error:
    return;
}

#endif /* else XSLT_REFACTORED */

#ifdef XSLT_REFACTORED

/**
 * xsltIncludeComp:
 * @cctxt: the compilation context
 * @node:  the xsl:include node
 *
 * Process the xslt include node on the source node
 */
static xsltStyleItemIncludePtr
xsltCompileXSLTIncludeElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr node) {
    xsltStyleItemIncludePtr item;

    if ((cctxt == NULL) || (node == NULL) || (node->type != XML_ELEMENT_NODE))
  return(NULL);

    node->psvi = NULL;
    item = (xsltStyleItemIncludePtr) xmlMalloc(sizeof(xsltStyleItemInclude));
    if (item == NULL) {
  xsltTransformError(NULL, cctxt->style, node,
    "xsltIncludeComp : malloc failed\n");
  cctxt->style->errors++;
  return(NULL);
    }
    memset(item, 0, sizeof(xsltStyleItemInclude));

    node->psvi = item;
    item->inst = node;
    item->type = XSLT_FUNC_INCLUDE;

    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;

    return(item);
}

/**
 * xsltParseFindTopLevelElem:
 */
static int
xsltParseFindTopLevelElem(xsltCompilerCtxtPtr cctxt,
            xmlNodePtr cur,
            const xmlChar *name,
            const xmlChar *namespaceURI,
            int breakOnOtherElem,
            xmlNodePtr *resultNode)
{
    if (name == NULL)
  return(-1);

    *resultNode = NULL;
    while (cur != NULL) {
  if (cur->type == XML_ELEMENT_NODE) {
      if ((cur->ns != NULL) && (cur->name != NULL)) {
    if ((*(cur->name) == *name) &&
        xmlStrEqual(cur->name, name) &&
        xmlStrEqual(cur->ns->href, namespaceURI))
    {
        *resultNode = cur;
        return(1);
    }
      }
      if (breakOnOtherElem)
    break;
  }
  cur = cur->next;
    }
    *resultNode = cur;
    return(0);
}

static int
xsltParseTopLevelXSLTElem(xsltCompilerCtxtPtr cctxt,
        xmlNodePtr node,
        xsltStyleType type)
{
    int ret = 0;

    /*
    * TODO: The reason why this function exists:
    *  due to historical reasons some of the
    *  top-level declarations are processed by functions
    *  in other files. Since we need still to set
    *  up the node-info and generate information like
    *  in-scope namespaces, this is a wrapper around
    *  those old parsing functions.
    */
    xsltCompilerNodePush(cctxt, node);
    if (node->nsDef != NULL)
  cctxt->inode->inScopeNs =
      xsltCompilerBuildInScopeNsList(cctxt, node);
    cctxt->inode->type = type;

    switch (type) {
  case XSLT_FUNC_INCLUDE:
      {
    int oldIsInclude;

    if (xsltCompileXSLTIncludeElem(cctxt, node) == NULL)
        goto exit;
    /*
    * Mark this stylesheet tree as being currently included.
    */
    oldIsInclude = cctxt->isInclude;
    cctxt->isInclude = 1;

    if (xsltParseStylesheetInclude(cctxt->style, node) != 0) {
        cctxt->style->errors++;
    }
    cctxt->isInclude = oldIsInclude;
      }
      break;
  case XSLT_FUNC_PARAM:
      xsltStylePreCompute(cctxt->style, node);
      xsltParseGlobalParam(cctxt->style, node);
      break;
  case XSLT_FUNC_VARIABLE:
      xsltStylePreCompute(cctxt->style, node);
      xsltParseGlobalVariable(cctxt->style, node);
      break;
  case XSLT_FUNC_ATTRSET:
      xsltParseStylesheetAttributeSet(cctxt->style, node);
      break;
  default:
      xsltTransformError(NULL, cctxt->style, node,
    "Internal error: (xsltParseTopLevelXSLTElem) "
    "Cannot handle this top-level declaration.\n");
      cctxt->style->errors++;
      ret = -1;
    }

exit:
    xsltCompilerNodePop(cctxt, node);

    return(ret);
}

#if 0
static int
xsltParseRemoveWhitespace(xmlNodePtr node)
{
    if ((node == NULL) || (node->children == NULL))
  return(0);
    else {
  xmlNodePtr delNode = NULL, child = node->children;

  do {
      if (delNode) {
    xmlUnlinkNode(delNode);
    xmlFreeNode(delNode);
    delNode = NULL;
      }
      if (((child->type == XML_TEXT_NODE) ||
     (child->type == XML_CDATA_SECTION_NODE)) &&
    (IS_BLANK_NODE(child)))
    delNode = child;
      child = child->next;
  } while (child != NULL);
  if (delNode) {
      xmlUnlinkNode(delNode);
      xmlFreeNode(delNode);
      delNode = NULL;
  }
    }
    return(0);
}
#endif

static int
xsltParseXSLTStylesheetElemCore(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
#ifdef WITH_XSLT_DEBUG_PARSING
    int templates = 0;
#endif
    xmlNodePtr cur, start = NULL;
    xsltStylesheetPtr style;

    if ((cctxt == NULL) || (node == NULL) ||
  (node->type != XML_ELEMENT_NODE))
  return(-1);

    style = cctxt->style;
    /*
    * At this stage all import declarations of all stylesheet modules
    * with the same stylesheet level have been processed.
    * Now we can safely parse the rest of the declarations.
    */
    if (IS_XSLT_ELEM_FAST(node) && IS_XSLT_NAME(node, "include"))
    {
  xsltDocumentPtr include;
  /*
  * URGENT TODO: Make this work with simplified stylesheets!
  *   I.e., when we won't find an xsl:stylesheet element.
  */
  /*
  * This is as include declaration.
  */
  include = ((xsltStyleItemIncludePtr) node->psvi)->include;
  if (include == NULL) {
      /* TODO: raise error? */
      return(-1);
  }
  /*
  * TODO: Actually an xsl:include should locate an embedded
  *  stylesheet as well; so the document-element won't always
  *  be the element where the actual stylesheet is rooted at.
  *  But such embedded stylesheets are not supported by Libxslt yet.
  */
  node = xmlDocGetRootElement(include->doc);
  if (node == NULL) {
      return(-1);
  }
    }

    if (node->children == NULL)
  return(0);
    /*
    * Push the xsl:stylesheet/xsl:transform element.
    */
    xsltCompilerNodePush(cctxt, node);
    cctxt->inode->isRoot = 1;
    cctxt->inode->nsChanged = 0;
    /*
    * Start with the naked dummy info for literal result elements.
    */
    cctxt->inode->litResElemInfo = cctxt->inodeList->litResElemInfo;

    /*
    * In every case, we need to have
    * the in-scope namespaces of the element, where the
    * stylesheet is rooted at, regardless if it's an XSLT
    * instruction or a literal result instruction (or if
    * this is an embedded stylesheet).
    */
    cctxt->inode->inScopeNs =
  xsltCompilerBuildInScopeNsList(cctxt, node);

    /*
    * Process attributes of xsl:stylesheet/xsl:transform.
    * --------------------------------------------------
    * Allowed are:
    *  id = id
    *  extension-element-prefixes = tokens
    *  exclude-result-prefixes = tokens
    *  version = number (mandatory)
    */
    if (xsltParseAttrXSLTVersion(cctxt, node,
  XSLT_ELEMENT_CATEGORY_XSLT) == 0)
    {
  /*
  * Attribute "version".
  * XSLT 1.0: "An xsl:stylesheet element *must* have a version
  *  attribute, indicating the version of XSLT that the
  *  stylesheet requires".
  * The root element of a simplified stylesheet must also have
  * this attribute.
  */
#ifdef XSLT_REFACTORED_MANDATORY_VERSION
  if (isXsltElem)
      xsltTransformError(NULL, cctxt->style, node,
    "The attribute 'version' is missing.\n");
  cctxt->style->errors++;
#else
  /* OLD behaviour. */
  xsltTransformError(NULL, cctxt->style, node,
      "xsl:version is missing: document may not be a stylesheet\n");
  cctxt->style->warnings++;
#endif
    }
    /*
    * The namespaces declared by the attributes
    *  "extension-element-prefixes" and
    *  "exclude-result-prefixes" are local to *this*
    *  stylesheet tree; i.e., they are *not* visible to
    *  other stylesheet-modules, whether imported or included.
    *
    * Attribute "extension-element-prefixes".
    */
    cctxt->inode->extElemNs =
  xsltParseExtElemPrefixes(cctxt, node, NULL,
      XSLT_ELEMENT_CATEGORY_XSLT);
    /*
    * Attribute "exclude-result-prefixes".
    */
    cctxt->inode->exclResultNs =
  xsltParseExclResultPrefixes(cctxt, node, NULL,
      XSLT_ELEMENT_CATEGORY_XSLT);
    /*
    * Create/reuse info for the literal result element.
    */
    if (cctxt->inode->nsChanged)
  xsltLREInfoCreate(cctxt, node, 0);
    /*
    * Processed top-level elements:
    * ----------------------------
    *  xsl:variable, xsl:param (QName, in-scope ns,
    *    expression (vars allowed))
    *  xsl:attribute-set (QName, in-scope ns)
    *  xsl:strip-space, xsl:preserve-space (XPath NameTests,
    *    in-scope ns)
    *    I *think* global scope, merge with includes
    *  xsl:output (QName, in-scope ns)
    *  xsl:key (QName, in-scope ns, pattern,
    *    expression (vars *not* allowed))
    *  xsl:decimal-format (QName, needs in-scope ns)
    *  xsl:namespace-alias (in-scope ns)
    *    global scope, merge with includes
    *  xsl:template (last, QName, pattern)
    *
    * (whitespace-only text-nodes have *not* been removed
    *  yet; this will be done in xsltParseSequenceConstructor)
    *
    * Report misplaced child-nodes first.
    */
    cur = node->children;
    while (cur != NULL) {
  if (cur->type == XML_TEXT_NODE) {
      xsltTransformError(NULL, style, cur,
    "Misplaced text node (content: '%s').\n",
    (cur->content != NULL) ? cur->content : BAD_CAST "");
      style->errors++;
  } else if (cur->type != XML_ELEMENT_NODE) {
      xsltTransformError(NULL, style, cur, "Misplaced node.\n");
      style->errors++;
  }
  cur = cur->next;
    }
    /*
    * Skip xsl:import elements; they have been processed
    * already.
    */
    cur = node->children;
    while ((cur != NULL) && xsltParseFindTopLevelElem(cctxt, cur,
      BAD_CAST "import", XSLT_NAMESPACE, 1, &cur) == 1)
  cur = cur->next;
    if (cur == NULL)
  goto exit;

    start = cur;
    /*
    * Process all top-level xsl:param elements.
    */
    while ((cur != NULL) &&
  xsltParseFindTopLevelElem(cctxt, cur,
  BAD_CAST "param", XSLT_NAMESPACE, 0, &cur) == 1)
    {
  xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_PARAM);
  cur = cur->next;
    }
    /*
    * Process all top-level xsl:variable elements.
    */
    cur = start;
    while ((cur != NULL) &&
  xsltParseFindTopLevelElem(cctxt, cur,
  BAD_CAST "variable", XSLT_NAMESPACE, 0, &cur) == 1)
    {
  xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_VARIABLE);
  cur = cur->next;
    }
    /*
    * Process all the rest of top-level elements.
    */
    cur = start;
    while (cur != NULL) {
  /*
  * Process element nodes.
  */
  if (cur->type == XML_ELEMENT_NODE) {
      if (cur->ns == NULL) {
    xsltTransformError(NULL, style, cur,
        "Unexpected top-level element in no namespace.\n");
    style->errors++;
    cur = cur->next;
    continue;
      }
      /*
      * Process all XSLT elements.
      */
      if (IS_XSLT_ELEM_FAST(cur)) {
    /*
    * xsl:import is only allowed at the beginning.
    */
    if (IS_XSLT_NAME(cur, "import")) {
        xsltTransformError(NULL, style, cur,
      "Misplaced xsl:import element.\n");
        style->errors++;
        cur = cur->next;
        continue;
    }
    /*
    * TODO: Change the return type of the parsing functions
    *  to int.
    */
    if (IS_XSLT_NAME(cur, "template")) {
#ifdef WITH_XSLT_DEBUG_PARSING
        templates++;
#endif
        /*
        * TODO: Is the position of xsl:template in the
        *  tree significant? If not it would be easier to
        *  parse them at a later stage.
        */
        xsltParseXSLTTemplate(cctxt, cur);
    } else if (IS_XSLT_NAME(cur, "variable")) {
        /* NOP; done already */
    } else if (IS_XSLT_NAME(cur, "param")) {
        /* NOP; done already */
    } else if (IS_XSLT_NAME(cur, "include")) {
        if (cur->psvi != NULL)
      xsltParseXSLTStylesheetElemCore(cctxt, cur);
        else {
      xsltTransformError(NULL, style, cur,
          "Internal error: "
          "(xsltParseXSLTStylesheetElemCore) "
          "The xsl:include element was not compiled.\n");
      style->errors++;
        }
    } else if (IS_XSLT_NAME(cur, "strip-space")) {
        /* No node info needed. */
        xsltParseStylesheetStripSpace(style, cur);
    } else if (IS_XSLT_NAME(cur, "preserve-space")) {
        /* No node info needed. */
        xsltParseStylesheetPreserveSpace(style, cur);
    } else if (IS_XSLT_NAME(cur, "output")) {
        /* No node-info needed. */
        xsltParseStylesheetOutput(style, cur);
    } else if (IS_XSLT_NAME(cur, "key")) {
        /* TODO: node-info needed for expressions ? */
        xsltParseStylesheetKey(style, cur);
    } else if (IS_XSLT_NAME(cur, "decimal-format")) {
        /* No node-info needed. */
        xsltParseStylesheetDecimalFormat(style, cur);
    } else if (IS_XSLT_NAME(cur, "attribute-set")) {
        xsltParseTopLevelXSLTElem(cctxt, cur,
      XSLT_FUNC_ATTRSET);
    } else if (IS_XSLT_NAME(cur, "namespace-alias")) {
        /* NOP; done already */
    } else {
        if (cctxt->inode->forwardsCompat) {
      /*
      * Forwards-compatible mode:
      *
      * XSLT-1: "if it is a top-level element and
      *  XSLT 1.0 does not allow such elements as top-level
      *  elements, then the element must be ignored along
      *  with its content;"
      */
      /*
      * TODO: I don't think we should generate a warning.
      */
      xsltTransformError(NULL, style, cur,
          "Forwards-compatible mode: Ignoring unknown XSLT "
          "element '%s'.\n", cur->name);
      style->warnings++;
        } else {
      xsltTransformError(NULL, style, cur,
          "Unknown XSLT element '%s'.\n", cur->name);
      style->errors++;
        }
    }
      } else {
    xsltTopLevelFunction function;

    /*
    * Process non-XSLT elements, which are in a
    *  non-NULL namespace.
    */
    /*
    * QUESTION: What does xsltExtModuleTopLevelLookup()
    *  do exactly?
    */
    function = xsltExtModuleTopLevelLookup(cur->name,
        cur->ns->href);
    if (function != NULL)
        function(style, cur);
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseXSLTStylesheetElemCore : User-defined "
        "data element '%s'.\n", cur->name);
#endif
      }
  }
  cur = cur->next;
    }

exit:

#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
  "### END of parsing top-level elements of doc '%s'.\n",
  node->doc->URL);
    xsltGenericDebug(xsltGenericDebugContext,
  "### Templates: %d\n", templates);
#ifdef XSLT_REFACTORED
    xsltGenericDebug(xsltGenericDebugContext,
  "### Max inodes: %d\n", cctxt->maxNodeInfos);
    xsltGenericDebug(xsltGenericDebugContext,
  "### Max LREs  : %d\n", cctxt->maxLREs);
#endif /* XSLT_REFACTORED */
#endif /* WITH_XSLT_DEBUG_PARSING */

    xsltCompilerNodePop(cctxt, node);
    return(0);
}

/**
 * xsltParseXSLTStylesheet:
 * @cctxt: the compiler context
 * @node: the xsl:stylesheet/xsl:transform element-node
 *
 * Parses the xsl:stylesheet and xsl:transform element.
 *
 * <xsl:stylesheet
 *  id = id
 *  extension-element-prefixes = tokens
 *  exclude-result-prefixes = tokens
 *  version = number>
 *  <!-- Content: (xsl:import*, top-level-elements) -->
 * </xsl:stylesheet>
 *
 * BIG TODO: The xsl:include stuff.
 *
 * Called by xsltParseStylesheetTree()
 *
 * Returns 0 on success, a positive result on errors and
 *         -1 on API or internal errors.
 */
static int
xsltParseXSLTStylesheetElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xmlNodePtr cur, start;

    if ((cctxt == NULL) || (node == NULL) || (node->type != XML_ELEMENT_NODE))
  return(-1);

    if (node->children == NULL)
  goto exit;

    /*
    * Process top-level elements:
    *  xsl:import (must be first)
    *  xsl:include (this is just a pre-processing)
    */
    cur = node->children;
    /*
    * Process xsl:import elements.
    * XSLT 1.0: "The xsl:import element children must precede all
    *  other element children of an xsl:stylesheet element,
    *  including any xsl:include element children."
    */
    while ((cur != NULL) &&
  xsltParseFindTopLevelElem(cctxt, cur,
      BAD_CAST "import", XSLT_NAMESPACE, 1, &cur) == 1)
    {
  if (xsltParseStylesheetImport(cctxt->style, cur) != 0) {
      cctxt->style->errors++;
  }
  cur = cur->next;
    }
    if (cur == NULL)
  goto exit;
    start = cur;
    /*
    * Pre-process all xsl:include elements.
    */
    cur = start;
    while ((cur != NULL) &&
  xsltParseFindTopLevelElem(cctxt, cur,
      BAD_CAST "include", XSLT_NAMESPACE, 0, &cur) == 1)
    {
  xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_INCLUDE);
  cur = cur->next;
    }
    /*
    * Pre-process all xsl:namespace-alias elements.
    * URGENT TODO: This won't work correctly: the order of included
    *  aliases and aliases defined here is significant.
    */
    cur = start;
    while ((cur != NULL) &&
  xsltParseFindTopLevelElem(cctxt, cur,
      BAD_CAST "namespace-alias", XSLT_NAMESPACE, 0, &cur) == 1)
    {
  xsltNamespaceAlias(cctxt->style, cur);
  cur = cur->next;
    }

    if (cctxt->isInclude) {
  /*
  * If this stylesheet is intended for inclusion, then
  * we will process only imports and includes.
  */
  goto exit;
    }
    /*
    * Now parse the rest of the top-level elements.
    */
    xsltParseXSLTStylesheetElemCore(cctxt, node);
exit:

    return(0);
}

#else /* XSLT_REFACTORED */

/**
 * xsltParseStylesheetTop:
 * @style:  the XSLT stylesheet
 * @top:  the top level "stylesheet" or "transform" element
 *
 * scan the top level elements of an XSL stylesheet
 */
static void
xsltParseStylesheetTop(xsltStylesheetPtr style, xmlNodePtr top) {
    xmlNodePtr cur;
    xmlChar *prop;
#ifdef WITH_XSLT_DEBUG_PARSING
    int templates = 0;
#endif

    if ((top == NULL) || (top->type != XML_ELEMENT_NODE))
  return;

    prop = xmlGetNsProp(top, (const xmlChar *)"version", NULL);
    if (prop == NULL) {
  xsltTransformError(NULL, style, top,
      "xsl:version is missing: document may not be a stylesheet\n");
  if (style != NULL) style->warnings++;
    } else {
  if ((!xmlStrEqual(prop, (const xmlChar *)"1.0")) &&
            (!xmlStrEqual(prop, (const xmlChar *)"1.1"))) {
      xsltTransformError(NULL, style, top,
    "xsl:version: only 1.1 features are supported\n");
      if (style != NULL) {
                style->forwards_compatible = 1;
                style->warnings++;
            }
  }
  xmlFree(prop);
    }

    /*
     * process xsl:import elements
     */
    cur = top->children;
    while (cur != NULL) {
      if (IS_BLANK_NODE(cur)) {
        cur = cur->next;
        continue;
      }
      if (IS_XSLT_ELEM(cur) && IS_XSLT_NAME(cur, "import")) {
        if (xsltParseStylesheetImport(style, cur) != 0)
          if (style != NULL) style->errors++;
      } else
        break;
      cur = cur->next;
    }

    /*
     * process other top-level elements
     */
    while (cur != NULL) {
  if (IS_BLANK_NODE(cur)) {
      cur = cur->next;
      continue;
  }
  if (cur->type == XML_TEXT_NODE) {
      if (cur->content != NULL) {
    xsltTransformError(NULL, style, cur,
        "misplaced text node: '%s'\n", cur->content);
      }
      if (style != NULL) style->errors++;
            cur = cur->next;
      continue;
  }
  if ((cur->type == XML_ELEMENT_NODE) && (cur->ns == NULL)) {
      xsltGenericError(xsltGenericErrorContext,
         "Found a top-level element %s with null namespace URI\n",
         cur->name);
      if (style != NULL) style->errors++;
      cur = cur->next;
      continue;
  }
  if ((cur->type == XML_ELEMENT_NODE) && (!(IS_XSLT_ELEM(cur)))) {
      xsltTopLevelFunction function;

      function = xsltExtModuleTopLevelLookup(cur->name,
               cur->ns->href);
      if (function != NULL)
    function(style, cur);

#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseStylesheetTop : found foreign element %s\n",
        cur->name);
#endif
            cur = cur->next;
      continue;
  }
  if (IS_XSLT_NAME(cur, "import")) {
      xsltTransformError(NULL, style, cur,
      "xsltParseStylesheetTop: ignoring misplaced import element\n");
      if (style != NULL) style->errors++;
        } else if (IS_XSLT_NAME(cur, "include")) {
      if (xsltParseStylesheetInclude(style, cur) != 0)
    if (style != NULL) style->errors++;
        } else if (IS_XSLT_NAME(cur, "strip-space")) {
      xsltParseStylesheetStripSpace(style, cur);
        } else if (IS_XSLT_NAME(cur, "preserve-space")) {
      xsltParseStylesheetPreserveSpace(style, cur);
        } else if (IS_XSLT_NAME(cur, "output")) {
      xsltParseStylesheetOutput(style, cur);
        } else if (IS_XSLT_NAME(cur, "key")) {
      xsltParseStylesheetKey(style, cur);
        } else if (IS_XSLT_NAME(cur, "decimal-format")) {
      xsltParseStylesheetDecimalFormat(style, cur);
        } else if (IS_XSLT_NAME(cur, "attribute-set")) {
      xsltParseStylesheetAttributeSet(style, cur);
        } else if (IS_XSLT_NAME(cur, "variable")) {
      xsltParseGlobalVariable(style, cur);
        } else if (IS_XSLT_NAME(cur, "param")) {
      xsltParseGlobalParam(style, cur);
        } else if (IS_XSLT_NAME(cur, "template")) {
#ifdef WITH_XSLT_DEBUG_PARSING
      templates++;
#endif
      xsltParseStylesheetTemplate(style, cur);
        } else if (IS_XSLT_NAME(cur, "namespace-alias")) {
      xsltNamespaceAlias(style, cur);
  } else {
            if ((style != NULL) && (style->forwards_compatible == 0)) {
          xsltTransformError(NULL, style, cur,
      "xsltParseStylesheetTop: unknown %s element\n",
      cur->name);
          if (style != NULL) style->errors++;
      }
  }
  cur = cur->next;
    }
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "parsed %d templates\n", templates);
#endif
}

#endif /* else of XSLT_REFACTORED */

#ifdef XSLT_REFACTORED
/**
 * xsltParseSimplifiedStylesheetTree:
 *
 * @style: the stylesheet (TODO: Change this to the compiler context)
 * @doc: the document containing the stylesheet.
 * @node: the node where the stylesheet is rooted at
 *
 * Returns 0 in case of success, a positive result if an error occurred
 *         and -1 on API and internal errors.
 */
static int
xsltParseSimplifiedStylesheetTree(xsltCompilerCtxtPtr cctxt,
          xmlDocPtr doc,
          xmlNodePtr node)
{
    xsltTemplatePtr templ;

    if ((cctxt == NULL) || (node == NULL))
  return(-1);

    if (xsltParseAttrXSLTVersion(cctxt, node, 0) == XSLT_ELEMENT_CATEGORY_LRE)
    {
  /*
  * TODO: Adjust report, since this might be an
  * embedded stylesheet.
  */
  xsltTransformError(NULL, cctxt->style, node,
      "The attribute 'xsl:version' is missing; cannot identify "
      "this document as an XSLT stylesheet document.\n");
  cctxt->style->errors++;
  return(1);
    }

#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
  "xsltParseSimplifiedStylesheetTree: document is stylesheet\n");
#endif

    /*
    * Create and link the template
    */
    templ = xsltNewTemplate();
    if (templ == NULL) {
  return(-1);
    }
    templ->next = cctxt->style->templates;
    cctxt->style->templates = templ;
    templ->match = xmlStrdup(BAD_CAST "/");

    /*
    * Note that we push the document-node in this special case.
    */
    xsltCompilerNodePush(cctxt, (xmlNodePtr) doc);
    /*
    * In every case, we need to have
    * the in-scope namespaces of the element, where the
    * stylesheet is rooted at, regardless if it's an XSLT
    * instruction or a literal result instruction (or if
    * this is an embedded stylesheet).
    */
    cctxt->inode->inScopeNs =
  xsltCompilerBuildInScopeNsList(cctxt, node);
    /*
    * Parse the content and register the match-pattern.
    */
    xsltParseSequenceConstructor(cctxt, node);
    xsltCompilerNodePop(cctxt, (xmlNodePtr) doc);

    templ->elem = (xmlNodePtr) doc;
    templ->content = node;
    xsltAddTemplate(cctxt->style, templ, NULL, NULL);
    cctxt->style->literal_result = 1;
    return(0);
}

#ifdef XSLT_REFACTORED_XSLT_NSCOMP
/**
 * xsltRestoreDocumentNamespaces:
 * @ns: map of namespaces
 * @doc: the document
 *
 * Restore the namespaces for the document
 *
 * Returns 0 in case of success, -1 in case of failure
 */
int
xsltRestoreDocumentNamespaces(xsltNsMapPtr ns, xmlDocPtr doc)
{
    if (doc == NULL)
  return(-1);
    /*
    * Revert the changes we have applied to the namespace-URIs of
    * ns-decls.
    */
    while (ns != NULL) {
  if ((ns->doc == doc) && (ns->ns != NULL)) {
      ns->ns->href = ns->origNsName;
      ns->origNsName = NULL;
      ns->ns = NULL;
  }
  ns = ns->next;
    }
    return(0);
}
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */

/**
 * xsltParseStylesheetProcess:
 * @style:  the XSLT stylesheet (the current stylesheet-level)
 * @doc:  and xmlDoc parsed XML
 *
 * Parses an XSLT stylesheet, adding the associated structures.
 * Called by:
 *  xsltParseStylesheetImportedDoc() (xslt.c)
 *  xsltParseStylesheetInclude() (imports.c)
 *
 * Returns the value of the @style parameter if everything
 * went right, NULL if something went amiss.
 */
xsltStylesheetPtr
xsltParseStylesheetProcess(xsltStylesheetPtr style, xmlDocPtr doc)
{
    xsltCompilerCtxtPtr cctxt;
    xmlNodePtr cur;
    int oldIsSimplifiedStylesheet;

    xsltInitGlobals();

    if ((style == NULL) || (doc == NULL))
  return(NULL);

    cctxt = XSLT_CCTXT(style);

    cur = xmlDocGetRootElement(doc);
    if (cur == NULL) {
  xsltTransformError(NULL, style, (xmlNodePtr) doc,
    "xsltParseStylesheetProcess : empty stylesheet\n");
  return(NULL);
    }
    oldIsSimplifiedStylesheet = cctxt->simplified;

    if ((IS_XSLT_ELEM(cur)) &&
  ((IS_XSLT_NAME(cur, "stylesheet")) ||
   (IS_XSLT_NAME(cur, "transform")))) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
    "xsltParseStylesheetProcess : found stylesheet\n");
#endif
  cctxt->simplified = 0;
  style->literal_result = 0;
    } else {
  cctxt->simplified = 1;
  style->literal_result = 1;
    }
    /*
    * Pre-process the stylesheet if not already done before.
    *  This will remove PIs and comments, merge adjacent
    *  text nodes, internalize strings, etc.
    */
    if (! style->nopreproc)
  xsltParsePreprocessStylesheetTree(cctxt, cur);
    /*
    * Parse and compile the stylesheet.
    */
    if (style->literal_result == 0) {
  if (xsltParseXSLTStylesheetElem(cctxt, cur) != 0)
      return(NULL);
    } else {
  if (xsltParseSimplifiedStylesheetTree(cctxt, doc, cur) != 0)
      return(NULL);
    }

    cctxt->simplified = oldIsSimplifiedStylesheet;

    return(style);
}

#else /* XSLT_REFACTORED */

/**
 * xsltParseStylesheetProcess:
 * @ret:  the XSLT stylesheet (the current stylesheet-level)
 * @doc:  and xmlDoc parsed XML
 *
 * Parses an XSLT stylesheet, adding the associated structures.
 * Called by:
 *  xsltParseStylesheetImportedDoc() (xslt.c)
 *  xsltParseStylesheetInclude() (imports.c)
 *
 * Returns the value of the @style parameter if everything
 * went right, NULL if something went amiss.
 */
xsltStylesheetPtr
xsltParseStylesheetProcess(xsltStylesheetPtr ret, xmlDocPtr doc) {
    xmlNodePtr cur;

    xsltInitGlobals();

    if (doc == NULL)
  return(NULL);
    if (ret == NULL)
  return(ret);

    /*
     * First steps, remove blank nodes,
     * locate the xsl:stylesheet element and the
     * namespace declaration.
     */
    cur = xmlDocGetRootElement(doc);
    if (cur == NULL) {
  xsltTransformError(NULL, ret, (xmlNodePtr) doc,
    "xsltParseStylesheetProcess : empty stylesheet\n");
  return(NULL);
    }

    if ((IS_XSLT_ELEM(cur)) &&
  ((IS_XSLT_NAME(cur, "stylesheet")) ||
   (IS_XSLT_NAME(cur, "transform")))) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
    "xsltParseStylesheetProcess : found stylesheet\n");
#endif
  ret->literal_result = 0;
  xsltParseStylesheetExcludePrefix(ret, cur, 1);
  xsltParseStylesheetExtPrefix(ret, cur, 1);
    } else {
  xsltParseStylesheetExcludePrefix(ret, cur, 0);
  xsltParseStylesheetExtPrefix(ret, cur, 0);
  ret->literal_result = 1;
    }
    if (!ret->nopreproc) {
  xsltPreprocessStylesheet(ret, cur);
    }
    if (ret->literal_result == 0) {
  xsltParseStylesheetTop(ret, cur);
    } else {
  xmlChar *prop;
  xsltTemplatePtr template;

  /*
   * the document itself might be the template, check xsl:version
   */
  prop = xmlGetNsProp(cur, (const xmlChar *)"version", XSLT_NAMESPACE);
  if (prop == NULL) {
      xsltTransformError(NULL, ret, cur,
    "xsltParseStylesheetProcess : document is not a stylesheet\n");
      return(NULL);
  }

#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
    "xsltParseStylesheetProcess : document is stylesheet\n");
#endif

  if ((!xmlStrEqual(prop, (const xmlChar *)"1.0")) &&
            (!xmlStrEqual(prop, (const xmlChar *)"1.1"))) {
      xsltTransformError(NULL, ret, cur,
    "xsl:version: only 1.1 features are supported\n");
            ret->forwards_compatible = 1;
      ret->warnings++;
  }
  xmlFree(prop);

  /*
   * Create and link the template
   */
  template = xsltNewTemplate();
  if (template == NULL) {
      return(NULL);
  }
  template->next = ret->templates;
  ret->templates = template;
  template->match = xmlStrdup((const xmlChar *)"/");

  /*
   * parse the content and register the pattern
   */
  xsltParseTemplateContent(ret, (xmlNodePtr) doc);
  template->elem = (xmlNodePtr) doc;
  template->content = doc->children;
  xsltAddTemplate(ret, template, NULL, NULL);
  ret->literal_result = 1;
    }

    return(ret);
}

#endif /* else of XSLT_REFACTORED */

/**
 * xsltParseStylesheetImportedDoc:
 * @doc:  an xmlDoc parsed XML
 * @parentStyle: pointer to the parent stylesheet (if it exists)
 *
 * parse an XSLT stylesheet building the associated structures
 * except the processing not needed for imported documents.
 *
 * Returns a new XSLT stylesheet structure.
 */

xsltStylesheetPtr
xsltParseStylesheetImportedDoc(xmlDocPtr doc,
             xsltStylesheetPtr parentStyle) {
    xsltStylesheetPtr retStyle;

    if (doc == NULL)
  return(NULL);

    retStyle = xsltNewStylesheetInternal(parentStyle);
    if (retStyle == NULL)
  return(NULL);

    if (xsltParseStylesheetUser(retStyle, doc) != 0) {
        xsltFreeStylesheet(retStyle);
        return(NULL);
    }

    return(retStyle);
}

/**
 * xsltParseStylesheetUser:
 * @style: pointer to the stylesheet
 * @doc:  an xmlDoc parsed XML
 *
 * Parse an XSLT stylesheet with a user-provided stylesheet struct.
 *
 * Returns 0 if successful, -1 in case of error.
 */
int
xsltParseStylesheetUser(xsltStylesheetPtr style, xmlDocPtr doc) {
    if ((style == NULL) || (doc == NULL))
  return(-1);

    /*
    * Adjust the string dict.
    */
    if (doc->dict != NULL) {
        xmlDictFree(style->dict);
  style->dict = doc->dict;
#ifdef WITH_XSLT_DEBUG
        xsltGenericDebug(xsltGenericDebugContext,
      "reusing dictionary from %s for stylesheet\n",
      doc->URL);
#endif
  xmlDictReference(style->dict);
    }

    /*
    * TODO: Eliminate xsltGatherNamespaces(); we must not restrict
    *  the stylesheet to containt distinct namespace prefixes.
    */
    xsltGatherNamespaces(style);

#ifdef XSLT_REFACTORED
    {
  xsltCompilerCtxtPtr cctxt;
  xsltStylesheetPtr oldCurSheet;

  if (style->parent == NULL) {
      xsltPrincipalStylesheetDataPtr principalData;
      /*
      * Create extra data for the principal stylesheet.
      */
      principalData = xsltNewPrincipalStylesheetData();
      if (principalData == NULL) {
    return(-1);
      }
      style->principalData = principalData;
      /*
      * Create the compilation context
      * ------------------------------
      * (only once; for the principal stylesheet).
      * This is currently the only function where the
      * compilation context is created.
      */
      cctxt = xsltCompilationCtxtCreate(style);
      if (cctxt == NULL) {
    return(-1);
      }
      style->compCtxt = (void *) cctxt;
      cctxt->style = style;
      cctxt->dict = style->dict;
      cctxt->psData = principalData;
      /*
      * Push initial dummy node info.
      */
      cctxt->depth = -1;
      xsltCompilerNodePush(cctxt, (xmlNodePtr) doc);
  } else {
      /*
      * Imported stylesheet.
      */
      cctxt = style->parent->compCtxt;
      style->compCtxt = cctxt;
  }
  /*
  * Save the old and set the current stylesheet structure in the
  * compilation context.
  */
  oldCurSheet = cctxt->style;
  cctxt->style = style;

  style->doc = doc;
  xsltParseStylesheetProcess(style, doc);

  cctxt->style = oldCurSheet;
  if (style->parent == NULL) {
      /*
      * Pop the initial dummy node info.
      */
      xsltCompilerNodePop(cctxt, (xmlNodePtr) doc);
  } else {
      /*
      * Clear the compilation context of imported
      * stylesheets.
      * TODO: really?
      */
      /* style->compCtxt = NULL; */
  }

#ifdef XSLT_REFACTORED_XSLT_NSCOMP
        if (style->errors != 0) {
            /*
            * Restore all changes made to namespace URIs of ns-decls.
            */
            if (cctxt->psData->nsMap)
                xsltRestoreDocumentNamespaces(cctxt->psData->nsMap, doc);
        }
#endif

        if (style->parent == NULL) {
            xsltCompilationCtxtFree(style->compCtxt);
            style->compCtxt = NULL;
        }
    }

#else /* XSLT_REFACTORED */
    /*
    * Old behaviour.
    */
    style->doc = doc;
    if (xsltParseStylesheetProcess(style, doc) == NULL) {
        style->doc = NULL;
        return(-1);
    }
#endif /* else of XSLT_REFACTORED */

    if (style->parent == NULL)
        xsltResolveStylesheetAttributeSet(style);

    if (style->errors != 0) {
        /*
        * Detach the doc from the stylesheet; otherwise the doc
        * will be freed in xsltFreeStylesheet().
        */
        style->doc = NULL;
        /*
        * Cleanup the doc if its the main stylesheet.
        */
        if (style->parent == NULL)
            xsltCleanupStylesheetTree(doc, xmlDocGetRootElement(doc));
        return(-1);
    }

    return(0);
}

/**
 * xsltParseStylesheetDoc:
 * @doc:  an xmlDoc parsed XML
 *
 * parse an XSLT stylesheet, building the associated structures.  doc
 * is kept as a reference within the returned stylesheet, so changes
 * to doc after the parsing will be reflected when the stylesheet
 * is applied, and the doc is automatically freed when the
 * stylesheet is closed.
 *
 * Returns a new XSLT stylesheet structure.
 */

xsltStylesheetPtr
xsltParseStylesheetDoc(xmlDocPtr doc) {
    xsltInitGlobals();

    return(xsltParseStylesheetImportedDoc(doc, NULL));
}

/**
 * xsltParseStylesheetFile:
 * @filename:  the filename/URL to the stylesheet
 *
 * Load and parse an XSLT stylesheet
 *
 * Returns a new XSLT stylesheet structure.
 */

xsltStylesheetPtr
xsltParseStylesheetFile(const xmlChar* filename) {
    xsltSecurityPrefsPtr sec;
    xsltStylesheetPtr ret;
    xmlDocPtr doc;

    xsltInitGlobals();

    if (filename == NULL)
  return(NULL);

#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
      "xsltParseStylesheetFile : parse %s\n", filename);
#endif

    /*
     * Security framework check
     */
    sec = xsltGetDefaultSecurityPrefs();
    if (sec != NULL) {
  int res;

  res = xsltCheckRead(sec, NULL, filename);
  if (res <= 0) {
            if (res == 0)
                xsltTransformError(NULL, NULL, NULL,
                     "xsltParseStylesheetFile: read rights for %s denied\n",
                                 filename);
      return(NULL);
  }
    }

    doc = xsltDocDefaultLoader(filename, NULL, XSLT_PARSE_OPTIONS,
                               NULL, XSLT_LOAD_START);
    if (doc == NULL) {
  xsltTransformError(NULL, NULL, NULL,
    "xsltParseStylesheetFile : cannot parse %s\n", filename);
  return(NULL);
    }
    ret = xsltParseStylesheetDoc(doc);
    if (ret == NULL) {
  xmlFreeDoc(doc);
  return(NULL);
    }

    return(ret);
}

/************************************************************************
 *                  *
 *      Handling of Stylesheet PI     *
 *                  *
 ************************************************************************/

#define CUR (*cur)
#define SKIP(val) cur += (val)
#define NXT(val) cur[(val)]
#define SKIP_BLANKS           \
    while (IS_BLANK(CUR)) NEXT
#define NEXT ((*cur) ?  cur++ : cur)

/**
 * xsltParseStylesheetPI:
 * @value: the value of the PI
 *
 * This function checks that the type is text/xml and extracts
 * the URI-Reference for the stylesheet
 *
 * Returns the URI-Reference for the stylesheet or NULL (it need to
 *         be freed by the caller)
 */
static xmlChar *
xsltParseStylesheetPI(const xmlChar *value) {
    const xmlChar *cur;
    const xmlChar *start;
    xmlChar *val;
    xmlChar tmp;
    xmlChar *href = NULL;
    int isXml = 0;

    if (value == NULL)
  return(NULL);

    cur = value;
    while (CUR != 0) {
  SKIP_BLANKS;
  if ((CUR == 't') && (NXT(1) == 'y') && (NXT(2) == 'p') &&
      (NXT(3) == 'e')) {
      SKIP(4);
      SKIP_BLANKS;
      if (CUR != '=')
    continue;
      NEXT;
      if ((CUR != '\'') && (CUR != '"'))
    continue;
      tmp = CUR;
      NEXT;
      start = cur;
      while ((CUR != 0) && (CUR != tmp))
    NEXT;
      if (CUR != tmp)
    continue;
      val = xmlStrndup(start, cur - start);
      NEXT;
      if (val == NULL)
    return(NULL);
      if ((xmlStrcasecmp(val, BAD_CAST "text/xml")) &&
    (xmlStrcasecmp(val, BAD_CAST "text/xsl")) &&
    (xmlStrcasecmp(val, BAD_CAST "application/xslt+xml"))) {
                xmlFree(val);
    break;
      }
      isXml = 1;
      xmlFree(val);
  } else if ((CUR == 'h') && (NXT(1) == 'r') && (NXT(2) == 'e') &&
      (NXT(3) == 'f')) {
      SKIP(4);
      SKIP_BLANKS;
      if (CUR != '=')
    continue;
      NEXT;
      if ((CUR != '\'') && (CUR != '"'))
    continue;
      tmp = CUR;
      NEXT;
      start = cur;
      while ((CUR != 0) && (CUR != tmp))
    NEXT;
      if (CUR != tmp)
    continue;
      if (href == NULL)
    href = xmlStrndup(start, cur - start);
      NEXT;
  } else {
      while ((CUR != 0) && (!IS_BLANK(CUR)))
    NEXT;
  }

    }

    if (!isXml) {
  if (href != NULL)
      xmlFree(href);
  href = NULL;
    }
    return(href);
}

/**
 * xsltLoadStylesheetPI:
 * @doc:  a document to process
 *
 * This function tries to locate the stylesheet PI in the given document
 * If found, and if contained within the document, it will extract
 * that subtree to build the stylesheet to process @doc (doc itself will
 * be modified). If found but referencing an external document it will
 * attempt to load it and generate a stylesheet from it. In both cases,
 * the resulting stylesheet and the document need to be freed once the
 * transformation is done.
 *
 * Returns a new XSLT stylesheet structure or NULL if not found.
 */
xsltStylesheetPtr
xsltLoadStylesheetPI(xmlDocPtr doc) {
    xmlNodePtr child;
    xsltStylesheetPtr ret = NULL;
    xmlChar *href = NULL;
    xmlURIPtr URI;

    xsltInitGlobals();

    if (doc == NULL)
  return(NULL);

    /*
     * Find the text/xml stylesheet PI id any before the root
     */
    child = doc->children;
    while ((child != NULL) && (child->type != XML_ELEMENT_NODE)) {
  if ((child->type == XML_PI_NODE) &&
      (xmlStrEqual(child->name, BAD_CAST "xml-stylesheet"))) {
      href = xsltParseStylesheetPI(child->content);
      if (href != NULL)
    break;
  }
  child = child->next;
    }

    /*
     * If found check the href to select processing
     */
    if (href != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
  xsltGenericDebug(xsltGenericDebugContext,
    "xsltLoadStylesheetPI : found PI href=%s\n", href);
#endif
  URI = xmlParseURI((const char *) href);
  if (URI == NULL) {
      xsltTransformError(NULL, NULL, child,
        "xml-stylesheet : href %s is not valid\n", href);
      xmlFree(href);
      return(NULL);
  }
  if ((URI->fragment != NULL) && (URI->scheme == NULL) &&
            (URI->opaque == NULL) && (URI->authority == NULL) &&
            (URI->server == NULL) && (URI->user == NULL) &&
            (URI->path == NULL) && (URI->query == NULL)) {
      xmlAttrPtr ID;

#ifdef WITH_XSLT_DEBUG_PARSING
      xsltGenericDebug(xsltGenericDebugContext,
        "xsltLoadStylesheetPI : Reference to ID %s\n", href);
#endif
      if (URI->fragment[0] == '#')
    ID = xmlGetID(doc, (const xmlChar *) &(URI->fragment[1]));
      else
    ID = xmlGetID(doc, (const xmlChar *) URI->fragment);
      if (ID == NULL) {
    xsltTransformError(NULL, NULL, child,
        "xml-stylesheet : no ID %s found\n", URI->fragment);
      } else {
    xmlDocPtr fake;
    xmlNodePtr subtree, newtree;
    xmlNsPtr ns;

#ifdef WITH_XSLT_DEBUG
    xsltGenericDebug(xsltGenericDebugContext,
        "creating new document from %s for embedded stylesheet\n",
        doc->URL);
#endif
    /*
     * move the subtree in a new document passed to
     * the stylesheet analyzer
     */
    subtree = ID->parent;
    fake = xmlNewDoc(NULL);
    if (fake != NULL) {
        /*
        * Should the dictionary still be shared even though
        * the nodes are being copied rather than moved?
        */
        fake->dict = doc->dict;
        xmlDictReference(doc->dict);
#ifdef WITH_XSLT_DEBUG
        xsltGenericDebug(xsltGenericDebugContext,
      "reusing dictionary from %s for embedded stylesheet\n",
      doc->URL);
#endif

        newtree = xmlDocCopyNode(subtree, fake, 1);

        fake->URL = xmlNodeGetBase(doc, subtree->parent);
#ifdef WITH_XSLT_DEBUG
        xsltGenericDebug(xsltGenericDebugContext,
      "set base URI for embedded stylesheet as %s\n",
      fake->URL);
#endif

        /*
        * Add all namespaces in scope of embedded stylesheet to
        * root element of newly created stylesheet document
        */
        while ((subtree = subtree->parent) != (xmlNodePtr)doc) {
      for (ns = subtree->ns; ns; ns = ns->next) {
          xmlNewNs(newtree,  ns->href, ns->prefix);
      }
        }

        xmlAddChild((xmlNodePtr)fake, newtree);
        ret = xsltParseStylesheetDoc(fake);
        if (ret == NULL)
      xmlFreeDoc(fake);
    }
      }
  } else {
      xmlChar *URL, *base;

      /*
       * Reference to an external stylesheet
       */

      base = xmlNodeGetBase(doc, (xmlNodePtr) doc);
      URL = xmlBuildURI(href, base);
      if (URL != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
      "xsltLoadStylesheetPI : fetching %s\n", URL);
#endif
    ret = xsltParseStylesheetFile(URL);
    xmlFree(URL);
      } else {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
      "xsltLoadStylesheetPI : fetching %s\n", href);
#endif
    ret = xsltParseStylesheetFile(href);
      }
      if (base != NULL)
    xmlFree(base);
  }
  xmlFreeURI(URI);
  xmlFree(href);
    }
    return(ret);
}

Coverage Report

Created: 2024-08-25 12:19