Modeling verb valency in a computational grammar for Portuguese in the HPSG formalism

• Autor(a) principal: Alencar, Leonel Figueiredo de
• Data de Publicação: 2022
• Outros Autores: Rademaker, Alexandre
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Domínios de Lingu@gem
• Texto Completo: https://seer.ufu.br/index.php/dominiosdelinguagem/article/view/64132
• topic: Linguística computacional; Engenharia da gramática; Análise sintática automática; Valência; Semântica computacional; Computational linguistics; Grammar engineering; Syntactic parsing; Valence; Computational semantics

HPSG is a lexicalist grammatical theory that proposes the parallel formalization of morphosyntactic and semantic structures. This work describes the computational implementation of verbal valences in a new Portuguese grammar in this formalism. This grammar is relevant not only for text understanding applications, but also represents a contribution to the formal documentation of the structures of the language, standing out for its treatment of control and raising constructions. The grammar has been incrementally implemented through its application to increasingly comprehensive test suites. With 278 entries and a total of 215 lemmas, the verb lexicon is still small. However, the proposed type hierarchy models the properties of 118 valence classes, of which 57 are types that encode  verb classes. The grammar analyzes 94% of a total of 581 grammatical sentences, while showing low hypergeneration in a set of 167 ungrammatical examples.