<fDecl>

<fDecl> (feature declaration) declares a single feature, specifying its name, organization, range of allowed values, and optionally its default value. 18.11 Feature System Declaration
組件iso-fs — 18 Feature Structures
屬性att.global (@xml:id, @n, @xml:lang, @rend, @rendition, @xml:base, @xml:space) (att.global.linking (@corresp, @synch, @sameAs, @copyOf, @next, @prev, @exclude, @select)) (att.global.analytic (@ana)) (att.global.facs (@facs)) (att.global.change (@change))
nameindicates the name of the feature being declared; matches the name attribute of f elements in the text.
狀態 必備的
資料類型 

<rng:ref name="data.name"/>
data.name
值 any string of characters
optionalindicates whether or not the value of this feature may be present.
狀態 非必備的
資料類型 

<rng:data type="boolean"/>
xsd:boolean
屬於
可包含在於
iso-fs: fsDecl
可包含
iso-fs: fDescr vDefault vRange
宣告

<rng:element name="fDecl">
 <rng:ref name="att.global.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:attribute name="name">
  <rng:ref name="data.name"/>
 </rng:attribute>
 <rng:optional>
  <rng:attribute name="optional" a:defaultValue="true">
   <rng:data type="boolean"/>
  </rng:attribute>
 </rng:optional>
 <rng:group>
  <rng:optional>
   <rng:ref name="fDescr"/>
  </rng:optional>
  <rng:ref name="vRange"/>
  <rng:optional>
   <rng:ref name="vDefault"/>
  </rng:optional>
 </rng:group>
</rng:element>
element fDecl
{
   att.global.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   attribute name { data.name },
   attribute optional { xsd:boolean }?,
   ( fDescr?, vRange, vDefault? )
}
例子
<fDecl name="INV">
 <fDescr>inverted sentence</fDescr>
 <vRange>
  <vAlt>
   <binary value="true"/>
   <binary value="false"/>
  </vAlt>
 </vRange>
 <vDefault>
  <binary value="false"/>
 </vDefault>
</fDecl>