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<Pets>
<Pet>
<name>Polly</name>
<completely>
<useless>
<hierarchy/>
</useless>
</completely>
<some>
<other>
<type>incorrect type tag</type>
<another>
<nested>
<tag/>
</nested>
</another>
<useful>
<tags>
<type>Parrot</type>
<size>incorrect size tag</size>
</tags>
</useful>
<age 1value="12"/>
</other>
<size>Small</size>
</some>
</Pet>
</Pets>