DOM Level 2 Core Specification: http://www.w3.org/TR/DOM-Level-2-Core/
DOM Level 2 Traversal and Range Specification: http://www.w3.org/TR/DOM-Level-2-Traversal-Range/
Java and XML, Brett McLaughlin, O'Reilly & Associates, 2000, ISBN 0-596-00016-2, http://www.oreilly.com/catalog/javaxml/