P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="facsimile">
 <rng:ref name="att.global.attributes"/>
 <rng:group>
  <rng:optional>
   <rng:ref name="front"/>
  </rng:optional>
  <rng:oneOrMore>
   <rng:choice>
    <rng:ref name="model.graphicLike"/>
    <rng:ref name="surface"/>
   </rng:choice>
  </rng:oneOrMore>
  <rng:optional>
   <rng:ref name="back"/>
  </rng:optional>
 </rng:group>
</rng:element>

element facsimile
{
   att.global.attributes,
   ( front?, ( model.graphicLike | surface )+, back? )
}