P5: Linee guida per la codifica e l'interscambio del testo elettronico

<rng:element name="msDesc">
<rng:ref name="att.global.attributes"/>
<rng:group>
 <rng:ref name="msIdentifier"/>
 <rng:zeroOrMore>
  <rng:ref name="model.headLike"/>
 </rng:zeroOrMore>
 <rng:choice>
  <rng:oneOrMore>
   <rng:ref name="model.pLike"/>
  </rng:oneOrMore>
  <rng:group>
   <rng:optional>
    <rng:ref name="msContents"/>
   </rng:optional>
   <rng:optional>
    <rng:ref name="physDesc"/>
   </rng:optional>
   <rng:optional>
    <rng:ref name="history"/>
   </rng:optional>
   <rng:optional>
    <rng:ref name="additional"/>
   </rng:optional>
   <rng:zeroOrMore>
    <rng:ref name="msPart"/>
   </rng:zeroOrMore>
  </rng:group>
 </rng:choice>
</rng:group>
</rng:element>

element msDesc
{
   att.global.attributes,
   (
      msIdentifier,
      model.headLike*,
      (
         model.pLike+
       | ( msContents?, physDesc?, history?, additional?, msPart* )
      )
   )
}