This presentation: http://www.cafeconleche.org/slides/sd2007west/java5xml/
Document Object Model (DOM) Level 3 Core Specification Version 1.0: http://www.w3.org/TR/DOM-Level-3-Core
Document Object Model (DOM) Level 3 Load and Save Specification: http://www.w3.org/TR/DOM-Level-3-LS/
Document Object Model (DOM) Requirements: http://www.w3.org/TR/DOM-Requirements/
Java XPath API: http://www-128.ibm.com/developerworks/xml/library/x-javaxpathapi.html
Java Validation API: http://www-128.ibm.com/developerworks/xml/library/x-javaxmlvalidapi.html
XML Digital Signatures API: http://java.sun.com/developer/technicalArticles/xml/dig_signature_api/
An introduction to StAX: http://www.xml.com/pub/a/2003/09/17/stax.html