<alternate>

<alternate> indicates that the constructs referenced by its children form an alternation [22.5.1 Defining Content Models]
Module tagdocs — Documentation Elements
Attributes
Member of
model.contentPart
Contained by
tagdocs: alternate content sequence
May contain
tagdocs: alternate anyElement classRef dataRef elementRef empty macroRef sequence textNode valList
Example
<content>
 <alternate>
  <elementRef key="name"/>
  <elementRef key="persName"/>
 </alternate>
</content>

This example content model permits either a name or a persName.
Schematron

<sch:assert test="count(*)>1">The alternate element must have at least two child elements</sch:assert>
Content model 
<content>
 <alternate minOccurs="1"
  maxOccurs="unbounded">
  <elementRef key="valList"/>
  <classRef key="model.contentPart"/>
 </alternate>
</content>
Schema Declaration 
<rng:element name="alternate">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.rendition.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:ref name="att.repeatable.attributes"/>
 <rng:oneOrMore>
  <rng:choice>
   <rng:ref name="valList"/>
   <rng:ref name="model.contentPart"/>
  </rng:choice>
 </rng:oneOrMore>
</rng:element>
element alternate
{
   att.global.attributes,
   att.global.rendition.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   att.repeatable.attributes,
   ( valList | model.contentPart )+
}