Versioning XML Languages Using XML Schema 1.1
2007-07-20: The XML Schema Working Group has released an updated Working Draft of Guide to Versioning XML Languages using XML Schema 1.1. XML Schema 1.1 introduces new features that make it easier to define XML languages which are flexible enough to tolerate later revision in a forward-compatible way. Written for application and schema developers, the guide shows the new mechanisms and illustrates several techniques. Visit the XML home page. (Permalink)
Read more at: http://www.w3.org/News/2007#item158.