P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="titleStmt">
<rng:ref name="att.global.attributes"/>
<rng:group>
 <rng:oneOrMore>
  <rng:ref name="title"/>
 </rng:oneOrMore>
 <rng:zeroOrMore>
  <rng:choice>
   <rng:ref name="author"/>
   <rng:ref name="editor"/>
   <rng:ref name="sponsor"/>
   <rng:ref name="funder"/>
   <rng:ref name="principal"/>
   <rng:ref name="respStmt"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:group>
</rng:element>

element titleStmt
{
   att.global.attributes,
   ( title+, ( author | editor | sponsor | funder | principal | respStmt )* )
}