Explorations of a domain of locality: Lexicalized Tree-Adjoining Grammar

Each grammar formalism speciies a domain of locality, i.e., a domain over which various dependencies (syntactic and semantic) can be speci-ed. It turns about that the various properties of a formalism (syntactic, semantic, computational , and even psycholinguistic), follow, to a large extent, from the initial speciication of the domain of locality. In this paper, we will brieey explore the extended domain of locality provided by the Lexicalized Tree-Adjoining Grammar (LTAG) in the context of some linguistic, computational, and psycholinguistic properties. This extended domain is achieved by specifying the elementary objects as structured objects (trees or directed acyclic graphs) instead of strings and two universal combining operations. Using lexicalized elementary structured objects it is possible to study directly many aspects of strong generative capacity which are more relevant to the linguistic descriptions.