<?xml version="1.1"?>
<!DOCTYPE foo [
<!ELEMENT foo (bar?)>
<!ATTLIST foo xmlns:a CDATA #IMPLIED
              a:attr CDATA #IMPLIED>
<!ELEMENT bar (foo)>
<!ATTLIST bar xmlns:a CDATA #IMPLIED>
]>
<!-- 1.1 style prefix unbinding and rebinding -->
<foo xmlns:a="http://example.org/namespace">
 <bar xmlns:a="">
  <foo xmlns:a="http://example.org/other-namespace" a:attr="1"/>
 </bar>
</foo>
