P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="fsdDecl">
 <rng:ref name="att.global.attributes"/>
 <rng:oneOrMore>
  <rng:choice>
   <rng:ref name="fsDecl"/>
   <rng:ref name="fsdLink"/>
  </rng:choice>
 </rng:oneOrMore>
</rng:element>

element fsdDecl { att.global.attributes, ( fsDecl | fsdLink )+ }