nestable C/C++ parser

[Arnold, Curt]

I think your original request got lost in a side track.  If is very possible
to do what you want with expat.  The trick is the use of the XML_SetUserData
and the userdata argument.  Basically, the trick is to create a base class
that has methods that you want to change the behavior of (typically,
StartElement and EndElement).  Create derived classes for each different
behavior that you want.  Call XML_SetUserData to the initial handler object.
In your StartElement callback, cast the userdata argument up to a pointer to
your base class and call its startElement virtual method.  If you want to
change the handler, make another call to XML_SetUserData.

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