invalid2.rng

<grammar xmlns:html="http://www.w3.org/TR/REC-html40" 
         xmlns="http://relaxng.org/ns/structure/1.0" >
  <start>
    <element name="foo">
      <zeroOrMore>
        <group>
          <attribute name="bar"/>
          <attribute name="baz"/>
        </group>
      </zeroOrMore>
    </element>
  </start>
</grammar>