In brief: clarify the kinds of DOM nodes that can be
validated/transformed. Clarify that implementations may support union types on
getElementTypeInfo(). Clarify inheritance semantics of features set on
a SchemaFactory.

Add javax.xml.validation.SchemaFactoryLoader to JAXP 1.4. It was
removed from 1.3 but accidentally became part of Tiger. Putting it
back in 1.4 (with a "do not use" health warning) seems like the best
compromise at this stage.
Approved by CCC; changes checked in to jaxp-sources on java.net