P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="pVar">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.ptrLike.form.attributes"/>
 <rng:ref name="att.lexicographic.attributes"/>
 <rng:zeroOrMore>
  <rng:choice>
   <rng:text/>
   <rng:ref name="model.gLike"/>
   <rng:ref name="pRef"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:element>

element pVar
{
   att.global.attributes,
   att.ptrLike.form.attributes,
   att.lexicographic.attributes,
   ( text | model.gLike | pRef )*
}