- W3C - XML

Own description: "Extensible Markup Language (XML)"
- Oasis
- Not-for-profit, international consortium for the development and adoption of e-business standards.Own description: "OASIS (Organization for the Advancement of Structured Information Standards) is an international, not-for-profit consortium that drives the development, convergence and adoption of open standards for the global information society."
- W3C - XHTML
- HTML reformulated in XML.Own description: "XHTML™ 1.1 - Module-based XHTML - Second Edition"
- W3C - XLink
- XML Linking Language to describe links between XML resources.Own description: "XML Linking Language (XLink) Version 1.0"
- W3C - XPath
- XML Path Language for addressing parts of an XML document.Own description: "XML Path Language (XPath)"
- W3C - XPointer
- XML Pointer Language. XPointer supports addressing into the internal structures of XML documents.Own description: "XML Pointer Language (XPointer) Version 1.0"
- Wotsit's Format
- File Format Collection.Own description: "Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information. The place to share useful resources with other programmers."
- XBL - XML Binding Language
- Documentation by W3C.Own description: "XML Binding Language (XBL) 2.0"
- XML-RPC
- Protocol for distributed computing. Remote procedure calling using HTTP as the transport and XML as the encoding.Own description: "XML-RPC Home Page"
- Zvon
- Documentation and tutorials on XML and related technologies.Own description: "ZVON.org - ZVON"