<element name="addressBook" ns="http://www.example.com"
xmlns="http://relaxng.org/ns/structure/1.0">
<zeroOrMore>
<element name="card" ns="http://www.example.com">
<element name="name" ns="http://www.example.com">
<text/>
</element>
<element name="email" ns="http://www.example.com">
<text/>
</element>
</element>
</zeroOrMore>
</element>