You can read the XML Schema,SOAP,WSDL, UDDI from RMH.
For API oriented topics I would prefer reading the JWSD tutorial from SUN. For topics like SAAJ, JAX-RPC,JAXR tutorial from SUN gives good material. RMH's material for these topics is kind of toooooooooo descriptive and time consuuuuuuuming. I would recommend reading the material from SUN tutorial for API oriented topics and then glancing through the RMH book.