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Computational Linguistics

Hwee Tou Ng, Editor
March 2015, Vol. 41, No. 1, Pages 41-70
(doi: 10.1162/COLI_a_00217)
© 2015 Association for Computational Linguistics
Multiple Adjunction in Feature-Based Tree-Adjoining Grammar
Article PDF (781.15 KB)

In parsing with Tree Adjoining Grammar (TAG), independent derivations have been shown by Schabes and Shieber (1994) to be essential for correctly supporting syntactic analysis, semantic interpretation, and statistical language modeling. However, the parsing algorithm they propose is not directly applicable to Feature-Based TAGs (FB-TAG). We provide a recognition algorithm for FB-TAG that supports both dependent and independent derivations. The resulting algorithm combines the benefits of independent derivations with those of Feature-Based grammars. In particular, we show that it accounts for a range of interactions between dependent vs. independent derivation on the one hand, and syntactic constraints, linear ordering, and scopal vs. nonscopal semantic dependencies on the other hand.