P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="langUsage">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.declarable.attributes"/>
 <rng:oneOrMore>
  <rng:choice>
   <rng:ref name="language"/>
  </rng:choice>
 </rng:oneOrMore>
</rng:element>

element langUsage
{
   att.global.attributes,
   att.declarable.attributes,
   language+
}