<forest>

<forest> 匯集具根節點的樹狀結構群組。 [19.3 Another Tree Notation]
組件nets — Graphs, Networks, and Trees
屬性att.global (@xml:id, @n, @xml:lang, @rend, @style, @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))
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
俱乐部会员
model.divPart
可包含在於
core: item note q quote said stage
drama: castList epilogue performance prologue set view
figures: cell figure
header: change handNote licence scriptNote typeNote
msdescription: accMat acquisition additions collation condition custEvent decoNote filiation foliation layout musicNotation origin provenance source support surrogates
nets: listForest
tagdocs: specGrp
textstructure: argument body div div1 div2 div3 div4 div5 div6 div7 epigraph postscript
transcr: metamark
可包含
nets: eTree tree triangle
宣告

<rng:element name="forest">
 <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: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,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.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>