3 - add SAX wrapper for Parsifal ?
4 http://www.saunalahti.fi/~samiuus/toni/xmlproc/
6 - add a DOM builder which can create a DOM from a libxml2 or
7 CoreFoundation DOM tree instead of using SAX
8 (should be much more efficient)
10 - write a SAX driver based on NSXMLParser (should be an almost trivial 1:1