P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="castGroup">
 <rng:ref name="att.global.attributes"/>
 <rng:group>
  <rng:zeroOrMore>
   <rng:choice>
    <rng:ref name="model.global"/>
    <rng:ref name="model.headLike"/>
   </rng:choice>
  </rng:zeroOrMore>
  <rng:oneOrMore>
   <rng:choice>
    <rng:ref name="castItem"/>
    <rng:ref name="castGroup"/>
    <rng:ref name="roleDesc"/>
   </rng:choice>
   <rng:zeroOrMore>
    <rng:ref name="model.global"/>
   </rng:zeroOrMore>
  </rng:oneOrMore>
  <rng:optional>
   <rng:ref name="trailer"/>
   <rng:zeroOrMore>
    <rng:ref name="model.global"/>
   </rng:zeroOrMore>
  </rng:optional>
 </rng:group>
</rng:element>

element castGroup
{
   att.global.attributes,
   (
      ( model.global | model.headLike )*,
      ( ( castItem | castGroup | roleDesc ), model.global* )+,
      ( trailer, model.global* )?
   )
}