<?xml version="1.0"?>
<!-- Attribute uniqueness: prefixed and unprefixed attributes with same
     local name, with default namespace -->
<foo xmlns:a="http://example.org/~wilbur"
     xmlns:b="http://example.org/~kipper"
     xmlns="http://example.org/~wilbur">

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

</foo>