[Zope] Using SSI with Zope

hi! I really need to find out how to have server side includes within a zope document. Is this possible? so far i've created an external method in the Extensions directory which looks like this... def hx_include(filename): return '<!--#include file="%s"-->' % filename and set this up in Zope using the 'External Method - Add' option. All is well, but how can I now actually use the ssi within my webpage? any help would be greatly appreciated, many thanks, Tom. -- ----------------------------------------------------------------------- Tom Freeman Industrial Placement NISS, Eduserv Tel: 01225 323789 Fax: 01225 826177 Web: http://www.niss.ac.uk