[XalanJ2] org.apache.serialize.transition proposal

[Sc...@lotus.com]

There are a number of problems with Xerces2's serializers, the main problem
being that they don't implement the TrAX serializer.* interfaces (which are
still a work in progress anyway).  In order to use these interfaces, and to
get to a point where we can pass our conformance tests, I propose to copy
the org.apache.serialize.* code into org.apache.serialize.transition.* in
the XalanJ2 project.  This will allow us time to get things right without
destabilizing the Xerces serializers, and then we can feed the .transition
serializers back into the Xerces project in a few months.

I'm going to go forward with this plan unless I hear strong objections.

-scott