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

<rng:element name="altIdentifier">
<rng:ref name="att.global.attributes"/>
<rng:ref name="att.typed.attributes"/>
<rng:group>
 <rng:ref name="model.placeNamePart_sequenceOptional"/>
 <rng:optional>
  <rng:ref name="institution"/>
 </rng:optional>
 <rng:optional>
  <rng:ref name="repository"/>
 </rng:optional>
 <rng:optional>
  <rng:ref name="collection"/>
 </rng:optional>
 <rng:ref name="idno"/>
 <rng:optional>
  <rng:ref name="note"/>
 </rng:optional>
</rng:group>
</rng:element>

element altIdentifier
{
   att.global.attributes,
   att.typed.attributes,
   (
      model.placeNamePart_sequenceOptional,
      institution?,
      repository?,
      collection?,
      idno,
      note?
   )
}