Xml-apis.jar from the apache xml commons project is used by the xerces-j xml parser and xalan-j xslt processor and specifies these apis:
* document object model (dom) level 3
* simple api for xml (sax) 2.0.2
* java apis for xml processing (jaxp) 1.3.04
* transformation api for xml (trax) 1.3.04
* document object model (dom) level 3 load and save
* jsr 206 java api for xml processing 1.3
these classes are also used in sun's reference implementation. a gpl'ed implementation of these apis can be found in the libgnujaxp-java package.