<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
Modulenets — 19 Graphs, Networks, and Trees
AttributesIn addition to global attributes
valueprovides the value of a triangle, which is the identifier of a feature structure or other analytic element.
Status Required when applicable
Datatype 

<rng:ref name="data.pointer"/>
data.pointer
Values A valid identifier of a feature structure or other analytic element.
Used by
eTree forest triangle
May contain
core: label
nets: eLeaf eTree triangle
Declaration

<rng:element name="triangle">
<rng:ref name="att.global.attributes"/>
<rng:optional>
 <rng:attribute name="value">
  <rng:ref name="data.pointer"/>
 </rng:attribute>
</rng:optional>
<rng:group>
 <rng:optional>
  <rng:ref name="label"/>
 </rng:optional>
 <rng:zeroOrMore>
  <rng:choice>
   <rng:ref name="eTree"/>
   <rng:ref name="triangle"/>
   <rng:ref name="eLeaf"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:group>
</rng:element>
element triangle
{
   att.global.attributes,
   attribute value { data.pointer }?,
   ( label?, ( eTree | triangle | eLeaf )* )
}
Example
<triangle>
 <label>NP</label>
 <eLeaf>
  <label>the periscope</label>
 </eLeaf>
</triangle>
Note
An optional label followed by zero or more embedding trees, triangles, or embedding leafs.