<?xml version="1.0"?>
<x attr="override-attr" attr2="simple-use" attr3="multiple-use" attr4="'override-attr4'" use-attribute-sets="not-recognized">
<y />
</x>
<x attr="simple" attr6="fwd" attr7="ns">
<y />
</x>
<bookstore attr="simple" attr2="override-attr2" xmlns:my="http://my.com">
<elem attr="simple" attr6="fwd" attr5="fwd-use" />
</bookstore>
