- XML (SAX) Docs : http://www.php.net/xml
- SimpleXML Docs : http://www.php.net/simplexml
- DOM Docs : http://www.php.net/dom
- XSL Docs : http://www.php.net/xsl
- SOAP Docs : http://www.php.net/soap
- XML-RPC Docs: http://www.php.net/xml-rpc
- XML-Writer Docs: http://www.php.net/xmlwriter
- XML-Reader Docs: http://www.php.net/xmlreader
- W3C XML: http://www.w3.org/XML/
- W3C XML in deutsch: http://edition-w3c.de/TR/2000/REC-xml-20001006/
- W3C XPath: http://www.w3.org/TR/xpath
- W3C XPath in deutsch: http://www.edition-w3c.de/TR/xpath
- W3C XSL: http://www.w3.org/TR/xsl/
- W3C XSLT: http://www.w3.org/TR/xslt
- W3C XSLT in deutsch: http://www.edition-w3c.de/TR/xslt
- W3C DOM: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html