libxml2-2.7.7/test/relaxng/tutor9_11.rng

<grammar xmlns="http://relaxng.org/ns/structure/1.0">

  <include href="addressBook.rng">

    <define name="cardContent">
      <element name="name">
	<text/>
      </element>
      <element name="emailAddress">
	<text/>
      </element>
    </define>

  </include>

</grammar>