<?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>