A Formal Look at Dependency Grammars and Phrase-Structure Grammars, with Special Consideration of Word-Order Phenomena

摘要

The central role of the lexicon in Meaning-Text Theory (MTT) and otherdependency-based linguistic theories cannot be replicated in linguistictheories based on context-free grammars (CFGs). We describe Tree AdjoiningGrammar (TAG) as a system that arises naturally in the process of lexicalizingCFGs. A TAG grammar can therefore be compared directly to an Meaning-Text Model(MTM). We illustrate this point by discussing the computational complexity ofcertain non-projective constructions, and suggest a way of incorporatinglocality of word-order definitions into the Surface-Syntactic Component of MTT.