<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. [20.3 Another Tree Notation]
Module nets — Graphs, Networks, and Trees
Attributes
value⚓︎ supplies a value for the triangle, in the form of the identifier of a feature structure or other analytic element.
Status Optional
Datatype teidata.pointer
Contained by
nets: eTree forest triangle
May contain
core: label
nets: eLeaf eTree triangle
Note

An optional label followed by zero or more embedding trees, triangles, or embedding leafs.
Example
<triangle>
 <label>NP</label>
 <eLeaf>
  <label>the periscope</label>
 </eLeaf>
</triangle>
Content model 
<content>
 <sequence>
  <elementRef key="label" minOccurs="0"/>
  <alternate minOccurs="0"
   maxOccurs="unbounded">
   <elementRef key="eTree"/>
   <elementRef key="triangle"/>
   <elementRef key="eLeaf"/>
  </alternate>
 </sequence>
</content>
Schema Declaration 
<rng:element name="triangle">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.rendition.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:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:optional>
  <rng:attribute name="value">
   <rng:ref name="teidata.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,
   att.global.rendition.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   attribute value { teidata.pointer }?,
   ( label?, ( eTree | triangle | eLeaf )* )
}