test/relaxng/tutor11_2.rng

<element name="card" ns="http://www.example.com"
         xmlns="http://relaxng.org/ns/structure/1.0">
  <zeroOrMore>
    <attribute>
      <anyName>
        <except>
          <nsName/>
          <nsName ns=""/>
        </except>
      </anyName>
    </attribute>
  </zeroOrMore>
  <text/>
</element>