JAXP 1.0 supported SAX 1.0 and DOM 1.0
JAXP 1.1 supports SAX 2 and DOM 2, bundled with Java 1.4
JAXP 1.2 adds support for W3C XML schemas
JAXP 1.3 adds moves from Crimson to Xerces; adds DOM 3; bundled with Java 5
JAXP 1.4 adds support for StAX; bundled with Java 6