<bar:Something xmlns:bar=“example.org/bar” xml:lang=“en-ie”>

    xmlns:foo="http://example.org/foo"
      <bar:Something xml:lang="en-ie">
          xmlns:foo="http://example.org/foo"
           <baz:Something xmlns:baz="http://example.org/baz" xml:lang="en-ie"></baz:Something>

      </bar:Something>

</bar:Something>