Namespace URIs
RFC 3986 - Uniform Resource Identifier (URI): Generic SyntaxEach URI begins with a scheme name that refers to a specification for assigning identifiers within that scheme.
 XMLVS
Using Namespace Documents for XML Versioning
Namespace Versioning
Major changes in the schema of the namespace would result in a new version of this namespace. So the namespace URI needs to specify a version.
Namespaces and versioning
http://www.ibm.com/developerworks/xml/library/x-tipnamsp.html#dw-summary-article

Using XML namespaces to mark the version of XML formats

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