P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="oVar">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.ptrLike.form.attributes"/>
 <rng:ref name="att.lexicographic.attributes"/>
 <rng:optional>
  <rng:attribute name="type">
   <rng:ref name="data.enumerated"/>
  </rng:attribute>
 </rng:optional>
 <rng:zeroOrMore>
  <rng:choice>
   <rng:text/>
   <rng:ref name="model.gLike"/>
   <rng:ref name="oRef"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:element>

element oVar
{
   att.global.attributes,
   att.ptrLike.form.attributes,
   att.lexicographic.attributes,
   attribute type { data.enumerated }?,
   ( text | model.gLike | oRef )*
}