Using default inheritance to describe LTAG
<|reference_start|>Using default inheritance to describe LTAG: 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.<|reference_end|>
@article{evans1995using,
    title={Using default inheritance to describe LTAG},
    author={Roger Evans (University of Brighton), Gerald Gazdar, David Weir
  (University of Sussex)},
    journal={Proceedings of TAG+3, 1994},
    year={1995},
    archivePrefix={arXiv},
    eprint={cmp-lg/9501001},
    primaryClass={cmp-lg cs.CL}
}