<element name="addressBook" xmlns="http://relaxng.org/ns/structure/1.0" xmlns:a="http://www.example.com/annotation">
<zeroOrMore>
<element name="card">
<a:documentation>Information about a single email address.</a:documentation>
<element name="name">
<text/>
</element>
<element name="email">
<text/>
</element>
</element>
</zeroOrMore>
</element>