tutorial.html [10.Namespaces]

10.Namespaces 
...

      but not any of

      <foo/>
      <e:foo xmlns:e="http://WWW.EXAMPLE.COM"/>
      <example:foo xmlns:example="http://www.example.net"/>

it's a small point, but does not the matter of whether the first
negative example is matched depend on the element's context. a similar
issue arises for the "null" namespace example.