[Zope] manage_addFile - getting DTML method results as file input

I have a DTML method 'resource_xml' that produces an XML file. I'm want to apply this method to the records returned by a zSQL 'selectExportDocs' and save each the XML for each one. <dtml-call "REQUEST.set('file_type', 'text/xml' )"> <dtml-in "queries.selectExportDocs()"> <dtml-in "resource_xml()"> <dtml-call "this().manage_addFile(REQUEST['id'], file, REQUEST['title'])"> </dtml-in> </dtml-in> How do I get the xml text returned by the method into the file input of manage_addFile? tia -- David