XML (Extensible Markup Language)A markup language that enables users to tag data in order to delimit it, leaving the interpretation of the data to the applications that read it.
XML Path Language (XPath)XPath is a language for finding information in an XML document. XPath is used to navigate through elements and attributes in an XML document.
XML-APIsFor more information, see http://www.apache.org.
XML-RPCFor more information, see http://www.apache.org.
XML::DBProvides an XML persistance layer using the postgresql database. For more information, see http://xmldb.sourceforge.net/.
XMLSecFor more information, see http://www.apache.org.