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

  <start>

    <element name="p">

      <ref name="inline"/>

    </element>

  </start>

  <define name="inline">

    <choice>

      <text/>

      <element name="bold">

        <ref name="inline"/>

      </element>

      <element name="italic">

        <ref name="inline"/>

      </element>

      <element name="span">

        <optional>

  	<attribute name="style"/>

        </optional>

        <ref name="inline"/>

      </element>

    </choice>

    <optional>

      <ref name="inline"/>

    </optional>

  </define>

</grammar>