Example: article.dsd, Part III

  <ElementDef ID="vitae">
    <Constraint IDRef="anything"/> <!-- INCOMPLETE -->
  </ElementDef>

  <ElementDef ID="link">
    <AttributeDecl Name="href" Optional="yes"><StringType IDRef="URI"/></AttributeDecl>
    <Content IDRef="simpletext"/>
  </ElementDef>

  <ContentDef ID="simpletext">
    <ZeroOrMore>
      <Content IDRef="simpletext-part"/>
    </ZeroOrMore>
  </ContentDef>

  <ContentDef ID="simpletext-part">
      <Union>
        <StringType/>
        <Element IDRef="amp"/>
        <Element IDRef="nbsp"/>
        <!-- INCOMPLETE -->
      </Union>
  </ContentDef>

  <ContentDef ID="paragraph-content">
    <ZeroOrMore>
      <Union>
        <Content IDRef="simpletext-part"/>
        <Element IDRef="cite"/>
        <Element IDRef="ref"/>
        <Element IDRef="link"/>
	<Element IDRef="tt"/>
	<Element IDRef="it"/>
	<Element IDRef="bf"/>
        <Element IDRef="br"/>
        <Element IDRef="itemize"/>
        <Element IDRef="oneline"/>
        <Element IDRef="example"/>
        <!-- INCOMPLETE -->
      </Union>
    </ZeroOrMore>
  </ContentDef>

  <ElementDef ID="paragraph" Name="p">
    <Content IDRef="paragraph-content"/>
  </ElementDef>