Canonical XML Version 1.1 Is a W3C Recommendation
2008-05-02: The XML Core Working Group has published the W3C Recommendation of Canonical XML Version 1.1. Canonical XML Version 1.1 is a revision to Canonical XML Version 1.0 to address issues related to inheritance of attributes in the XML namespace when canonicalizing document subsets, including the requirement not to inherit xml:id, and to treat xml:base URI path processing properly. Canonical XML Version 1.1 is applicable to XML 1.0 and defined in terms of the XPath 1.0 data model. It is not defined for XML 1.1. As a Recommendation, this is a stable document and may be used as reference material or cited from another document. Learn more about the Extensible Markup Language (XML) Activity. (Permalink)
Read more at: http://www.w3.org/News/2008#item90.