I see some recent bug reports and even a couple of patches on XmlSchema. There's the 1.4 branch where we're maintaining the classic code line: Java 1.4, lots of unfinished hanging apis, etc.
There's the trunk, where I produced a first pass at a 2.0. I think it could be a reasonable forward path, but then again, I'm the author. I posed a question on the Xerces list about the relationship of XmlSchema and Xerces. What I learned is that the Xerces community has no great interest in a 'construction' API for W3C XML Schema, as opposed to traversal and validation. In part, this is due to the existence of a code base at Eclipse. I have never found the time to go check out the Eclipse alternative. Anyway, we can just keep on as we are, making small adjustments to the 1.4 branch as we go, but I wondered if anyone else has a thought?
