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1. I n t r o d u c t i o n Compu ta t i ona l models employed by cu r ren t na tu ra l language unders tand ing systems re ly on p h r a s e s t r u c t u r e rep resen ta t i ons o f syn tax . Whether imp lemen ted as augmented t rans i t i on nets, BNF grammars, anno ta ted phrase-structure grammars, or s imi la r methods, a phrase-structure representation makes the pars ing p rob lem c o m p u t a t l o n a l l y t r a c t a b l e [ 7 ] . H o w e v e r , p h r a s e s t r u c t u r e rep resen ta t i ons have been open to the c r i t i c i s m tha t they do not cap tu re l i ngu i s t i c gene ra l i za t i ons t h a t are easi ly expressed in t r a n s f o r m a t i o n a l g rammars .

Capturing linguistic generalizations with metarules in an annotated phrase-structure grammar