P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="application">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:ref name="att.datable.w3c.attributes"/>
 <rng:ref name="att.datable.iso.attributes"/>
 <rng:attribute name="ident">
  <rng:ref name="data.name"/>
 </rng:attribute>
 <rng:attribute name="version">
  <rng:data type="token">
   <rng:param name="pattern">[\d]+[a-z]*[\d]*(\.[\d]+[a-z]*[\d]*){0,3}</rng:param>
  </rng:data>
 </rng:attribute>
 <rng:group>
  <rng:oneOrMore>
   <rng:ref name="model.labelLike"/>
  </rng:oneOrMore>
  <rng:choice>
   <rng:zeroOrMore>
    <rng:ref name="model.ptrLike"/>
   </rng:zeroOrMore>
   <rng:zeroOrMore>
    <rng:ref name="model.pLike"/>
   </rng:zeroOrMore>
  </rng:choice>
 </rng:group>
</rng:element>

element application
{
   att.global.attributes,
   att.typed.attributes,
   att.datable.w3c.attributes,
   att.datable.iso.attributes,
   attribute ident { data.name },
   attribute version
   {
      token { pattern = "[\d]+[a-z]*[\d]*(\.[\d]+[a-z]*[\d]*){0,3}" }
   },
   ( model.labelLike+, ( model.ptrLike* | model.pLike* ) )
}