[Zope] ZMI manage main and zpt to provide reasonable view of content type

[David Pratt]

Hi.  I have been working on a product in that works with filesystem 
content for CMF.  I have my content types developed and they are all 
registered and working fine but my hitch has to do with edit and views 
screens.  I want to emulate the way that the ZMI handles things because 
the manage_main screen is smart enough to display an edit area if 
content type is text/html etc. while it will display binary files 
without an edit area etc.

Where is manage_main for ZMI located to look at what it is doing so 
that I can potentially emulate its behavior in my edit and view ZPT?  I 
am not certain how many behaviors it has based on the type it gets - 
maybe there are really only a few.

Alternatively, if there are suggestions on what I could do in my ZPT to 
display the right view based on the object's content type, this would 
be quite welcome.  I don't want to resort to constructing a list of all 
content types (mime types)  and testing against these so am hoping I 
can hook into zope's functionality that is already doing this for ZMI.  
Many thanks.

David