<classes>

<classes> (classes) specifies all the classes of which the documented element or class is a member or subclass. [22.5 Element Specifications 22.6 Class Specifications]
Module tagdocs — Documentation Elements
Attributes
mode⚓︎ specifies the effect of this declaration on its parent module.
Status Optional
Datatype teidata.enumerated
Legal values are:
change
this declaration changes the declaration of the same name in the current definition
replace
this declaration replaces the declaration of the same name in the current definition [Default]
Contained by
tagdocs: classSpec elementSpec
May contain
tagdocs: memberOf
Note

An empty classes element indicates that the element documented is not a member of any class. This should not generally happen.
Example
<classes>
 <memberOf key="model.attributable"/>
 <memberOf key="att.declarable"/>
</classes>

This classes element indicates that the element documented (which may be an element or a class) is a member of two distinct classes: model.attributable and att.declarable.
Content model 
<content>
 <elementRef key="memberOf" minOccurs="0"
  maxOccurs="unbounded"/>
</content>
Schema Declaration 
<rng:element name="classes">
 <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:optional>
  <rng:attribute name="mode"
   a:defaultValue="replace">
   <rng:choice>
    <rng:value>change</rng:value>
    <rng:value>replace</rng:value>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:zeroOrMore>
  <rng:ref name="memberOf"/>
 </rng:zeroOrMore>
</rng:element>
element classes
{
   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,
   attribute mode { "change" | "replace" }?,
   memberOf*
}