P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="titlePart">
<rng:ref name="att.global.attributes"/>
<rng:optional>
 <rng:attribute name="type" a:defaultValue="main">
  <rng:choice>
   <rng:value>main</rng:value>
   <rng:value>sub</rng:value>
   <rng:value>alt</rng:value>
   <rng:value>short</rng:value>
   <rng:value>desc</rng:value>
   <rng:data type="Name"/>
  </rng:choice>
 </rng:attribute>
</rng:optional>
<rng:ref name="macro.paraContent"/>
</rng:element>

element titlePart
{
   att.global.attributes,
   attribute type { "main" | "sub" | "alt" | "short" | "desc" | xsd:Name }?,
   macro.paraContent
}