<fs>

<fs> (feature structure) represents a feature structure, that is, a collection of feature-value pairs organized as a structural unit. 18.2 Elementary Feature Structures and the Binary Feature Value
組件iso-fs — 18 Feature Structures
屬性
typespecifies the type of the feature structure.
狀態 可應用時必備的
資料類型 
data.enumerated
值 Character string, e.g. word structure.
feats (features) references the feature-value specifications making up this feature structure.
狀態 非必備的
資料類型 1–∞ occurrences of 
data.pointer
以空白鍵隔開
值 one or more identifiers of <f> elements.
註
May be used either instead of having features as content, or in addition. In the latter case, the features referenced and contained are unified.
屬於bicond cond if vColl model.featureVal.complex model.global.meta
可包含
iso-fs: f
宣告
element fs
{
   att.global.attributes,
   attribute type { data.enumerated }?,
   attribute feats { list { data.pointer+ } }?,
   f*
}
例子
<fs type="agreement_structure">
 <f name="person">
  <symbol value="third"/>
 </f>
 <f name="number">
  <symbol value="singular"/>
 </f>
</fs>