[Zope] Storing the Contents of a DTML Document in a Session Variable

I have a DTML document that contains some text(no HTML or DTML) and I use it repeatedly in other DTML documents to assign default values to variables passed via a form. Is it possible to assign the contents of this document to a session variable? I am using the following but it is syntactically incorrect: <dtml-call "REQUEST.SESSION.set('test', <dtml-var no_data>)"> where no_data is the name of the DTML document that contains the text. Any help would be greatly appreciated. Thanks. - Asad