<forest>

<forest> 匯集具根節點的樹狀結構群組。 19.3 Another Tree Notation
組件nets — 19 Graphs, Networks, and Trees
屬性
type標明森林的類型。
狀態 非必備的
資料類型 

<rng:ref name="data.enumerated"/>
data.enumerated
值 A character string.
屬於
forestGrp model.divPart
可包含
nets: eTree tree triangle
宣告

<rng:element name="forest">
<rng:ref name="att.global.attributes"/>
<rng:optional>
 <rng:attribute name="type">
  <rng:ref name="data.enumerated"/>
 </rng:attribute>
</rng:optional>
<rng:oneOrMore>
 <rng:choice>
  <rng:ref name="tree"/>
  <rng:ref name="eTree"/>
  <rng:ref name="triangle"/>
 </rng:choice>
</rng:oneOrMore>
</rng:element>
element forest
{
   att.global.attributes,
   attribute type { data.enumerated }?,
   ( tree | eTree | triangle )+
}
例子
<forest n="ex5" type="derivation-syntactic">
 <eTree n="Stage 1" xml:id="s1SBAR">
  <label>S'</label>
  <eTree xml:id="s1S">
   <label>S</label>
   <eTree xml:id="s1NP1">
    <label>NP</label>
    <eLeaf>
     <label>you</label>
    </eLeaf>
   </eTree>
   <eTree xml:id="s1VP">
    <label>VP</label>
    <eTree xml:id="s1V">
     <label>V</label>
     <eLeaf>
      <label>do</label>
     </eLeaf>
    </eTree>
   </eTree>
  </eTree>
 </eTree>
 <eTree n="Stage 2" xml:id="s2SBAR" corresp="#s1SBAR">
  <label>S'</label>
  <eTree xml:id="s2S" corresp="#s1S">
   <label>S</label>
   <eTree xml:id="s2NP1" copyOf="#s1NP1">
    <label>NP</label>
   </eTree>
   <eTree xml:id="s2VP" corresp="#s1VP">
    <label>VP</label>
    <eTree xml:id="s2V" copyOf="#s1V">
     <label>V</label>
    </eTree>
    <eTree xml:id="s2NP2" corresp="#s1NP2">
     <label>NP</label>
     <eLeaf corresp="#s1WH">
      <label>t</label>
     </eLeaf>
    </eTree>
   </eTree>
  </eTree>
 </eTree>
</forest>