Using default inheritance to describe LTAG

Evans, Roger, Gazdar, Gerald and Weir, David (1994) Using default inheritance to describe LTAG. In: Proceedings of the Third International Workshop on Tree Adjoining Grammars (TAG+3). Universite Paris 7, Paris.

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Abstract

We present the results of an investigation into how the set of elementary trees of a Lexicalized Tree Adjoining Grammar can be represented in the lexical knowledge representation language DATR (Evans & Gazdar 1989a,b). The LTAG under consideration is based on the one described in Abeille et al. (1990). Our approach is similar to that of Vijay-Shanker & Schabes (1992) in that we formulate an inheritance hierarchy that efficiently encodes the elementary trees. However,rather than creating a new representation formalism for this task, we employ techniques of established utility in other lexically-oriented frameworks. In particular, we show how DATR’s default mechanism can be used to eliminate the need for a non-immediate dominance relation in the descriptions of the surface LTAG entries. This allows us to embed the tree structures in the feature theory in a manner reminiscent of HPSG subcategorisation frames, and hence express lexical rules as relations over feature structures.

Item Type: Book Section
Schools and Departments: School of Engineering and Informatics > Informatics
Subjects: Q Science > QA Mathematics > QA0075 Electronic computers. Computer science
P Language and Literature > P Philology. Linguistics
Q Science > QA Mathematics > QA0076 Computer software
Depositing User: David Weir
Date Deposited: 22 Nov 2006
Last Modified: 30 Nov 2012 16:50
URI: http://sro.sussex.ac.uk/id/eprint/533
Google Scholar:5 Citations
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