XML in a Nutshell - includes XSLT & XPath, XLINKS, XPointers, CSS & XSL
Mastering XMI - I found this book a bit heavy going, it seems to spend a lot of
time talking about the importance of standards, introducing XML, UML and OMG.
However I found it hard to pick up the essence of XMI, why is it important and
how does it work. The book concentrates a lot on IBM programs such as WebSphere,
XML4J and XMI framework (not much on JMI) as you would expect from a book written
by IBMers.
Uml Power Tools:Building Uml Add-Ons...
Java & XML, 2nd Edition: Solutions to Real-World Problems