<vDefault>

<vDefault> (value default) declares the default value to be supplied when a feature structure does not contain an instance of f for this name; if unconditional, it is specified as one (or, depending on the value of the org attribute of the enclosing fDecl) more fs elements or primitive values; if conditional, it is specified as one or more if elements; if no default is specified, or no condition matches, the value none is assumed. [18.11 Feature System Declaration]
Module iso-fs — Feature Structures
Attributes att.global (@xml:id, @n, @xml:lang, @xml:base, @xml:space) (att.global.rendition (@rend, @style, @rendition)) (att.global.linking (@corresp, @synch, @sameAs, @copyOf, @next, @prev, @exclude, @select)) (att.global.analytic (@ana)) (att.global.facs (@facs)) (att.global.change (@change)) (att.global.responsibility (@cert, @resp)) (att.global.source (@source))
Contained by
iso-fs: fDecl
May contain
iso-fs: binary default fs if numeric string symbol vAlt vColl vLabel vMerge vNot
Note

May contain a legal feature value, or a series of if elements.
Example
<fDecl name="INV">
 <fDescr>inverted sentence</fDescr>
 <vRange>
  <vAlt>
   <binary value="true"/>
   <binary value="false"/>
  </vAlt>
 </vRange>
 <vDefault>
  <binary value="false"/>
 </vDefault>
</fDecl>
Content model 
<content>
 <alternate>
  <classRef key="model.featureVal"
   minOccurs="1" maxOccurs="unbounded"/>
  <elementRef key="if" minOccurs="1"
   maxOccurs="unbounded"/>
 </alternate>
</content>
Schema Declaration 
<rng:element name="vDefault">
 <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:choice>
  <rng:oneOrMore>
   <rng:ref name="model.featureVal"/>
  </rng:oneOrMore>
  <rng:oneOrMore>
   <rng:ref name="if"/>
  </rng:oneOrMore>
 </rng:choice>
</rng:element>
element vDefault
{
   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,
   ( model.featureVal+ | if+ )
}