<foo xmlns:petal_temp="http://purl.org/petal/1.0/">
<bar baz="default" petal_temp:attributes="baz baz_value" />
<buzz petal_temp:content="buzz_value">Default</buzz>
</foo>
<foo xmlns:petal_temp="http://purl.org/petal/1.0/">
<bar baz="default" petal_temp:attributes="baz baz_value" />
<buzz petal_temp:content="buzz_value">Default</buzz>
</foo>