<triangle>

<triangle> (underspecified embedding tree, so called because of its characteristic shape when drawn) Provides for an underspecified eTree, that is, an eTree with information left out. 19.3 Another Tree Notation
組件nets — 19 Graphs, Networks, and Trees
屬性
valueprovides the value of a triangle, which is the identifier of a feature structure or other analytic element.
狀態 可應用時必備的
資料類型 
data.pointer
值 A valid identifier of a feature structure or other analytic element.
屬於eTree forest triangle
可包含
core: label
nets: eLeaf eTree triangle
宣告
element triangle
{
   att.global.attributes,
   attribute value { data.pointer }?,
   ( label?, ( eTree | triangle | eLeaf )* )
}
例子
<triangle>
 <label>NP</label>
 <eLeaf>
  <label>the periscope</label>
 </eLeaf>
</triangle>
註
An optional label followed by zero or more embedding trees, triangles, or embedding leafs.