<element name=“addressBook” xmlns=“relaxng.org/ns/structure/1.0”>

<zeroOrMore>
  <element name="card">
    <interleave>
      <zeroOrMore>
        <element name="name">
          <text/>
        </element>
        <element name="email">
          <text/>
        </element>
      </zeroOrMore>
      <zeroOrMore>
        <element name="company">
          <text/>
        </element>
        <element name="email">
          <text/>
        </element>
      </zeroOrMore>
    </interleave>
  </element>
</zeroOrMore>

</element>