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

  <start>

    <element name="data">

      <interleave>

        <text/>

	<ref name="inline.class"/>

      </interleave>

    </element>

  </start>

  <define name="inline.class">

    <choice>

      <element name="bold">

        <ref name="inline"/>

      </element>

      <element name="italic">

        <ref name="inline"/>

      </element>

    </choice>

  </define>

  <define name="inline">

    <zeroOrMore>

      <choice>

        <text/>

        <element name="code">

          <ref name="inline"/>

        </element>

        <element name="em">

          <ref name="inline"/>

        </element>

      </choice>

    </zeroOrMore>

  </define>

</grammar>