Paper: Conditional Descriptions In Functional Unification Grammar

ACL ID P88-1029
Title Conditional Descriptions In Functional Unification Grammar
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 1988

A grammatical description often applies to a linguistic object only when that object has certain features. Such conditional descriptions can be indirectly modeled in Kay's Functional Unification Grammar (FUG) using functional descriptions that are embedded within disjunctive alternatives. An ex- tension to FUG is proposed that allows for a direct represen- tation of conditional descriptions. This extension has been used to model the input conditions on the systems of systemic grammar. Conditional descriptions are formally defined in terms of logical implication and negation. This formal defi- nition enables the use of conditional descriptions as a general notational extension to any of the unification-based gram° mar representation systems currently used in computational linguistics.