[Zope] render dtml from within return value

Hi, I'm a DTML-newbie and have the following problem: I have a DTML-method where I insert a call to a Python script which returns a string that contains DTML code. How can I make Zope render the DTML instead of just "inserting" it in the page when viewing it? the DTML-method: ... <dtml-var "get_body(fileid='file_htm')"> ... get_body is a Python scripts that takes the document_src from file_htm, cleans it up and returns the string (which contains some dtml codes). Or is this the wrong way to do a text-manipulation on a dtml-document before inserting it in another dtml-document/method? Brecht -- Brecht Samyn, Systeemgroep Katholieke Universiteit Leuven Campus Kortrijk (KULAK) tel. ++32 56 246 264