<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>