[Zope] SSI & DTML working together

I have a project for which I use ZDocument template package (DTML parser) without Zope. Eventually I realized that I have to use SSI in my templates. When I ran a parser on my new template, it gave me a ParseError exception, saying "Unexpected tag". I do know that I can get all of the SSI functionality via DTML. Anyway, maybe it would be convenient to make an option, say, to leave the 'unexpected tags' as is...? I made a very quick and dirty hack to ZDocumentTemplate source which allows me to do this. However, it would be nice if a patch could be made by someone who knows his way in the Zope source code more than I am. Thanks. -- Sergei