XML Linking Language (XLink) 1.1 is a W3C Recommendation

  The XML Core Working Group has published a W3C Recommendation of "XML Linking Language (XLink) Version 1.1." This
  specification defines the XML Linking Language (XLink) Version 1.1, which allows elements to be inserted into XML documents in order to create and describe links between resources. It uses XML syntax to create structures that can describe links similar to the simple unidirectional hyperlinks of today's HTML, as well as more sophisticated links. "Changes from XLink 1.0" include: xlink:type is no longer required for simple links, IRIs are used instead of URIs, and the specification includes
  non-normative sample XML Schema and RELAX NG grammars. 


Learn more about the Extensible Markup Language (XML) Activity.

  http://www.w3.org/XML/Core
  http://www.w3.org/TR/2010/REC-xlink11-20100506/
  http://www.w3.org/TR/2010/REC-xlink11-20100506/#changes
  http://www.w3.org/XML/


Source :  http://www.w3.org/News/2010#entry-8791