Java XML

In the realm of computing, Java XML APIs were created by Sun Microsystems as distinct application programming interfaces (APIs) dedicated to handling XML data.

Application programming interfaces

Java API for XML Processing (JAXP)
Java API for XML Messaging (JAXM)
Jakarta XML RPC (JAX-RPC) — previously known as Java API for XML Based RPC, now replaced by Java API for XML Web Services
Jakarta XML Registries (JAXR) — formerly called Java API for XML Registries
Jakarta XML Web Services (JAX-WS) — earlier referred to as Java API for XML Web Services
Jakarta RESTful Web Services (JAX-RS) — once named Java API for RESTful Web Services
Java API for XQuery (XQJ)
Jakarta XML Binding (JAXB) — previously known as Java Architecture for XML Binding
StAX (Streaming XML processing) — part of JDK 1.6 and compatible with JDK 1.4 and above

Among these, only the Java API for XML Processing (JAXP) is mandated by the Enterprise Java Beans Specification version 1.3.

Various open-source projects provide implementations of these APIs:

Apache Xerces — a popular parser supporting both SAX and DOM
Apache Xalan — an XSLT/XPath processor that serves as the default transformer starting with JDK 1.4
Saxon XSLT — an XSLT/XPath/XQuery processor compliant with versions 1.0 and 2.0
Woodstox — an open-source implementation of StAX and SAX available since version 3.2