cpython/Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nPrefixQname.xml

<n0:foo xmlns:n0="http://z0" xml:id="23">
  <n0:bar xmlns:n1="http://www.w3.org/2001/XMLSchema" xmlns:n2="http://www.w3.org/2001/XMLSchema-instance" n2:type="n1:string">data</n0:bar>
</n0:foo>