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Qualifying names

Simple solution: qualify names with URIs (Universal Resource Identifiers)

<{http://www.w3.org/TR/xhtml1}head>
  \                         / \  /
   -------------------------   --
       qualifying URI       local name

- same with attribute names.

Note: URI only used for identification - doesn't have to point at anything.

This is the idea... - but not exactly how it is done.