Paper: A Proposal For Modifications In The Formalism Of GPSG

ACL ID E87-1026
Title A Proposal For Modifications In The Formalism Of GPSG
Venue Annual Meeting of The European Chapter of The Association of Computational Linguistics
Session Main Conference
Year 1987

Recent investigations show a remarkable conver- gence among contemporary unification-based formal- isms for syntactic description. This convergence is now itself becoming an object of study, and there is an increasing recognition of the need for explicit characterizations of the properties that relate and distinguish similar grammar formalisms. The paper proposes a series of changes in the for- malism of Generalized Phrase Structure Grammar that throw light on its relation to Functional Unifica- tion Grammar. The essential contribution is a generalization of cooccurrence restrictions, which become the principal and unifying device of GPSG. Introducing Category Cooccurrence Restrictions (CCRs) for lo- cal trees (in analogy to Feature Cooccurrence Re- strictions for categories) provides a ge...