P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="terrain">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.datable.w3c.attributes"/>
 <rng:ref name="att.datable.iso.attributes"/>
 <rng:ref name="att.editLike.attributes"/>
 <rng:ref name="att.naming.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:group>
  <rng:zeroOrMore>
   <rng:ref name="model.headLike"/>
  </rng:zeroOrMore>
  <rng:choice>
   <rng:group>
    <rng:oneOrMore>
     <rng:ref name="model.pLike"/>
    </rng:oneOrMore>
   </rng:group>
   <rng:group>
    <rng:oneOrMore>
     <rng:ref name="model.labelLike"/>
    </rng:oneOrMore>
   </rng:group>
  </rng:choice>
  <rng:zeroOrMore>
   <rng:choice>
    <rng:ref name="model.noteLike"/>
    <rng:ref name="model.biblLike"/>
   </rng:choice>
  </rng:zeroOrMore>
  <rng:zeroOrMore>
   <rng:ref name="terrain"/>
  </rng:zeroOrMore>
 </rng:group>
</rng:element>

element terrain
{
   att.global.attributes,
   att.datable.w3c.attributes,
   att.datable.iso.attributes,
   att.editLike.attributes,
   att.naming.attributes,
   att.typed.attributes,
   (
      model.headLike*,
      ( ( model.pLike+ ) | ( model.labelLike+ ) ),
      ( model.noteLike | model.biblLike )*,
      terrain*
   )
}