P5: TEIガイドライン

<rng:element name="lbl">
<rng:ref name="att.global.attributes"/>
<rng:ref name="att.lexicographic.attributes"/>
<rng:optional>
 <rng:attribute name="type">
  <rng:ref name="data.enumerated"/>
 </rng:attribute>
</rng:optional>
<rng:ref name="macro.paraContent"/>
</rng:element>

element lbl
{
   att.global.attributes,
   att.lexicographic.attributes,
   attribute type { data.enumerated }?,
   macro.paraContent
}