1 <?xml version="1.0"?>

     2 <!-- Attribute uniqueness: prefixed and unprefixed attributes with same

     3      local name, element in same namespace as prefixed attribute -->

     4 <foo xmlns:a="http://example.org/~wilbur">

     5 

     6 <a:bar a:attr="1" attr="2"/>

     7 

     8 </foo>