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