P5: Guidelines for Electronic Text Encoding and Interchange

<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
}