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In appendix I.1, XSD 1.1 Datatypes says The use of the namespace http://www.w3.org/2001/XMLSchema-datatypes has been deprecated. The definition of a namespace separate from the main namespace defined by this specification proved not to be necessary or helpful in facilitating the use, by other specifications, of the datatypes defined here, and its use raises a number of difficult unsolved practical questions. http://www.w3.org/TR/xmlschema11-2/#sec-chdtfacets This was true at one point, I think, but it is no longer true: As a search for the string 'deprecat' makes clear, the spec says nothing now about deprecating the duplicate namespace. This appears to be a case of an initial change being recorded in the list of changes since 1.0, and then a later change which fails to be registered in the change list. Someone should probably be tasked to work systematically through the 1.1 change lists and make sure all of them are actually still true descriptions of the differences between 1.0 and 1.1.