<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.
Attributes:
label gives a label for an underspecified embedding tree.
Datatype: CDATA
Values: A character string.
Default: #IMPLIED
value provides the value of a triangle, which is the SGML identifier of a feature structure or other analytic element.
Datatype: IDREF
Values: A valid identifier of a feature structure or other analytic element.
Default: #IMPLIED
Example 
<triangle label='NP'><eLeaf label='the periscope'></triangle>
Tagsetadditional tag set for graphs, networks, and trees
Class
Filenameteinet2
Content: An optional label or feature structure followed by zero or more embedding trees, triangles, or embedding leafs.
ParentseTree forest triangle
ChildreneLeaf eTree triangle
Declaration
<!ELEMENT triangle      - -  ((eTree | triangle | eLeaf)*)      >
<!ATTLIST triangle           %a.global
          label              CDATA               #IMPLIED
          value              IDREF               #IMPLIED       >
See 21.3

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