Towards a comprehensive framework for the specification, representation and unification of complex feature structures: the lexical objects theory

• Autores: José Francisco Quesada Moreno
• Localización: Procesamiento del lenguaje natural, ISSN 1135-5948, Nº. 24, 1999, págs. 65-74
• Idioma: español
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• Resumen

  • This paper describes the main characteristics of the Lexical Objects Theory: a framework that comprehends the formal, linguistic and computational aspects involved in the study of unification and features structures in Computational Linguistics. From a functional point of view, our proposal is based on a layered architecture which distinguish between three main levels. Specification level introduces new expressive tools: optionality and special values (null, complete and incomplete), and defines the inference rules that obtain the canonical form of any lexical object. Representation level permits three models: InRange, DataDefined and EndLess, and concentrates on computational techniques aimed to improve the management of lexical objects. Finally, Unification Level defines formally Low Level Logic-based,Weak and Constructive Unification strategies.