Generates output based on a set of child items (of the Item Type identified by the Namespace parameter). The output generated for each item is formatted using the parsed
value of a Scrap named {Scrap}_BODY. The complete output is then prefixed with the parsed value of a Scrap named {Scrap}_HEADER and suffixed with the parsed value
of a Scrap named {Scrap}_FOOTER. No output is generated if no child items are found.