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

<rng:element name="category">
<rng:ref name="att.global.attributes"/>
<rng:group>
 <rng:choice>
  <rng:ref name="catDesc"/>
  <rng:zeroOrMore>
   <rng:ref name="model.glossLike"/>
  </rng:zeroOrMore>
 </rng:choice>
 <rng:zeroOrMore>
  <rng:ref name="category"/>
 </rng:zeroOrMore>
</rng:group>
</rng:element>

element category
{
   att.global.attributes,
   ( ( catDesc | model.glossLike* ), category* )
}