<if>

<if> defines a conditional default value for a feature; the condition is specified as a feature structure, and is met if it subsumes the feature structure in the text for which a default value is sought. 18.11 Feature System Declaration
Module iso-fs — 18 Feature Structures
Used by
vDefault
May contain
iso-fs: binary default f fs numeric string symbol then vAlt vColl vLabel vMerge vNot
Declaration 

<rng:element name="if">
 <rng:ref name="att.global.attributes"/>
 <rng:group>
  <rng:choice>
   <rng:ref name="fs"/>
   <rng:ref name="f"/>
  </rng:choice>
  <rng:ref name="then"/>
  <rng:group>
   <rng:ref name="model.featureVal"/>
  </rng:group>
 </rng:group>
</rng:element>
element if
{
   att.global.attributes,
   ( ( fs | f ), then, ( model.featureVal ) )
}
Example
<vDefault>
 <if>
  <fs>
   <f name="VFORM">
    <symbol value="INF"/>
   </f>
   <f name="SUBJ">
    <binary value="true"/>
   </f>
  </fs>
  <then/>
  <symbol value="for"/>
 </if>
</vDefault>
Note
May contain a feature structure, followed by a feature value; the two are separated by a then element.