P5: TEIガイドライン

<rng:element name="rendition">
<rng:ref name="att.global.attributes"/>
<rng:optional>
 <rng:attribute name="scheme">
  <rng:choice>
   <rng:value>css</rng:value>
   <rng:value>xslfo</rng:value>
   <rng:value>free</rng:value>
   <rng:value>other</rng:value>
  </rng:choice>
 </rng:attribute>
</rng:optional>
<rng:ref name="macro.limitedContent"/>
</rng:element>

element rendition
{
   att.global.attributes,
   attribute scheme { "css" | "xslfo" | "free" | "other" }?,
   macro.limitedContent
}