parameters

The set value pairs that represent the parameters passed to CloudFormation when this nested stack is created. Each parameter has a name corresponding to a parameter defined in the embedded template and a value representing the value that you want to set for the parameter.

If you use the Ref function to pass a parameter value to a nested stack, comma-delimited list parameters must be of type String . In other words, you can't pass values that are of type CommaDelimitedList to nested stacks. Conditional. Required if the nested stack requires input parameters. Whether an update causes interruptions depends on the resources that are being updated. An update never causes a nested stack to be replaced.