<cond>

<cond> (conditional feature-structure constraint) defines a conditional feature-structure constraint; the consequent and the antecedent are specified as feature structures or feature-structure collections; the constraint is satisfied if both the antecedent and the consequent subsume a given feature structure, or if the antecedent does not. 18.11 Feature System Declaration
Moduleiso-fs — 18 Feature Structures
AttributesGlobal attributes only
Used by
fsConstraints
May contain
iso-fs: f fs then
Declaration

<rng:element name="cond">
<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:choice>
  <rng:ref name="fs"/>
  <rng:ref name="f"/>
 </rng:choice>
</rng:group>
</rng:element>
element cond { att.global.attributes, ( ( fs | f ), then, ( fs | f ) ) }
Example
<cond>
 <fs>
  <f name="BAR">
   <symbol value="1"/>
  </f>
 </fs>
 <then/>
 <fs>
  <f name="SUBCAT">
   <binary value="false"/>
  </f>
 </fs>
</cond>
Note
May contain an antecedent feature structure, an empty then element, and a consequent feature structure.