1<element name="addressBook" ns="http://www.example.com"
2         xmlns="http://relaxng.org/ns/structure/1.0">
3  <zeroOrMore>
4    <element name="card" ns="http://www.example.com">
5      <attribute name="name" ns=""/>
6      <attribute name="email" ns=""/>
7    </element>
8  </zeroOrMore>
9</element>
10