cpython/Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nQname.xml

<foo xmlns="http://z0" xml:id="23">
  <bar xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:string">data</bar>
</foo>