[Zope] - Zope and converted content

I would like to pump SGML and XML files through various external converters (sometimes Python, sometimes not) when they are submitted as content. Is there some obvious way to hook these converters into Zope? Paul Prescod - ISOGEN Consulting Engineer speaking for only himself http://itrc.uwaterloo.ca/~papresco "Sports utility vehicles are gated communities on wheels" - Anon