<eTree>

<eTree> (embedding tree) provides an alternative to tree element for representing ordered rooted tree structures. 19.3 Another Tree Notation
組件nets — 19 Graphs, Networks, and Trees
屬性 att.typed (@type, @subtype)
valueprovides the value of an embedding tree, which is 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 model.divPart
可包含
core: label ptr ref
nets: eLeaf eTree triangle
宣告
element eTree
{
   att.global.attributes,
   att.typed.attributes,
   attribute value { data.pointer }?,
   ( label?, ( eTree | triangle | eLeaf | model.ptrLike )* )
}
例子
<eTree n="ex1">
 <label>PP</label>
 <eTree>
  <label>P</label>
  <eLeaf>
   <label>with</label>
  </eLeaf>
 </eTree>
 <eTree>
  <label>NP</label>
  <eTree>
   <label>Art</label>
   <eLeaf>
    <label>the</label>
   </eLeaf>
  </eTree>
  <eTree>
   <label>N</label>
   <eLeaf>
    <label>periscope</label>
   </eLeaf>
  </eTree>
 </eTree>
</eTree>
註
an optional label followed by zero or more embedding trees, triangles, or embedding leafs.