P5: TEI指引

<rng:element name="title">
<rng:ref name="att.global.attributes"/>
<rng:optional>
 <rng:attribute name="level">
  <rng:choice>
   <rng:value>a</rng:value>
   <rng:value>m</rng:value>
   <rng:value>j</rng:value>
   <rng:value>s</rng:value>
   <rng:value>u</rng:value>
  </rng:choice>
 </rng:attribute>
</rng:optional>
<rng:optional>
 <rng:attribute name="type">
  <rng:ref name="data.enumerated"/>
 </rng:attribute>
</rng:optional>
<rng:ref name="macro.paraContent"/>
</rng:element>

element title
{
   att.global.attributes,
   attribute level { "a" | "m" | "j" | "s" | "u" }?,
   attribute type { data.enumerated }?,
   macro.paraContent
}