Paper: Generalizing Dimensionality In Combinatory Categorial Grammar

ACL ID C04-1028
Title Generalizing Dimensionality In Combinatory Categorial Grammar
Venue International Conference on Computational Linguistics
Session Main Conference
Year 2004

We extend Combinatory Categorial Grammar (CCG) with a generalized notion of multi- dimensional sign, inspired by the types of rep- resentations found in constraint-based frame- works like HPSG or LFG. The generalized sign allows multiple levels to share information, but only in a resource-bounded way through a very restricted indexation mechanism. This improves representational perspicuity without increasing parsing complexity, in contrast to full-blown unification used in HPSG and LFG. Well-formedness of a linguistic expressions re- mains entirely determined by the CCG deriva- tion. We show how the multidimensionality and perspicuity of the generalized signs lead to a simplification of previous CCG accounts of how word order and prosody can realize infor- mation structure.