P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="personGrp">
 <rng:ref name="att.global.attributes"/>
 <rng:optional>
  <rng:attribute name="role">
   <rng:ref name="data.code"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="sex">
   <rng:choice>
    <rng:ref name="data.sex"/>
    <rng:value>mixed</rng:value>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="age">
   <rng:ref name="data.word"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="size">
   <rng:list>
    <rng:oneOrMore>
     <rng:ref name="data.word"/>
    </rng:oneOrMore>
   </rng:list>
  </rng:attribute>
 </rng:optional>
 <rng:choice>
  <rng:oneOrMore>
   <rng:ref name="model.pLike"/>
  </rng:oneOrMore>
  <rng:zeroOrMore>
   <rng:ref name="model.personPart"/>
  </rng:zeroOrMore>
 </rng:choice>
</rng:element>

element personGrp
{
   att.global.attributes,
   attribute role { data.code }?,
   attribute sex { data.sex | "mixed" }?,
   attribute age { data.word }?,
   attribute size { list { data.word+ } }?,
   ( model.pLike+ | model.personPart* )
}