Example: article.dsd, Part IV

  <ElementDef ID="amp"/>

  <ElementDef ID="nbsp"/>

  <ElementDef ID="percent"/>

  <ElementDef ID="br"/>

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

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

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

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

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

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

  <ElementDef ID="cite">
    <AttributeDecl Name="article" IDType="IDRef">
      <PointsTo><Context><Element IDRef="reference-item"/></Context></PointsTo>
    </AttributeDecl>
  </ElementDef>

  <ElementDef ID="ref">
    <AttributeDecl Name="section" IDType="IDRef" Optional="yes">
      <!-- INCOMPLETE, use PointsTo -->
    </AttributeDecl>
    <AttributeDecl Name="subsection" IDType="IDRef" Optional="yes">
      <!-- INCOMPLETE, use PointsTo -->
    </AttributeDecl>
    <OneOf><Attribute Name="section"/><Attribute Name="subsection"/></OneOf>
  </ElementDef>

</DSD>