<root>

<root> (root node) represents the root node of a tree. 19.2 Trees
組件nets — 19 Graphs, Networks, and Trees
屬性att.global (@xml:id, @n, @xml:lang, @rend, @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))
valueprovides the value of the root, which is a feature structure or other analytic element.
狀態 非必備的
資料類型 

<rng:ref name="data.pointer"/>
data.pointer
值 A valid identifier of a feature structure or other analytic element.
childrenprovides a list of identifiers of the elements which are the children of the root node.
狀態 必備的
資料類型 1–∞ 次可出現: 

<rng:ref name="data.pointer"/>
data.pointer
以空白鍵隔開
值 A list of valid identifiers.
ord (ordered) indicates whether or not the root is ordered.
狀態 非必備的
資料類型 

<rng:ref name="data.xTruthValue"/>
data.xTruthValue
outDegreegives the out degree of the root, the number of its children.
狀態 非必備的
資料類型 

<rng:ref name="data.count"/>
data.count
值 A nonnegative integer.
屬於
可包含在於
nets: tree
可包含
core: label
宣告

<rng:element name="root">
 <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="value">
   <rng:ref name="data.pointer"/>
  </rng:attribute>
 </rng:optional>
 <rng:attribute name="children">
  <rng:list>
   <rng:ref name="data.pointer"/>
   <rng:zeroOrMore>
    <rng:ref name="data.pointer"/>
   </rng:zeroOrMore>
  </rng:list>
 </rng:attribute>
 <rng:optional>
  <rng:attribute name="ord">
   <rng:ref name="data.xTruthValue"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="outDegree">
   <rng:ref name="data.count"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:ref name="label"/>
 </rng:optional>
</rng:element>
element root
{
   att.global.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   attribute value { data.pointer }?,
   attribute children { list { data.pointer, data.pointer* } },
   attribute ord { data.xTruthValue }?,
   attribute outDegree { data.count }?,
   label?
}
例子
<root xml:id="vp1" children="#vb1 #pn1" outDegree="2">
 <label>VP</label>
</root>
<leaf xml:id="vb1"/>
<leaf xml:id="pn1"/>