Korean Phrase Structure Grammar and Its Implementations into the LKB System
Jong‐Bok Kim, Jaehyung Yang · Institutional Repositories DataBase (IRDB) · 2003
Though there exist various morphological analysers developed for Korean, no serious attempts have been made to build its syntactic or semantic parser(s), partly because of its structural complexity and partly because of the existence of no reliable grammar-build up system. This paper presents a result of our on-going project to build up a computationally feasible Korean Phrase Structure Grammar (KPSG) and implementing it into the LKB (Linguistic Knowledge Building) system. The grammatical framework we adopt for KPSG is the constraint-based grammar, HPSG (Pollard and Sag 1994, Sag and Wasow 1999). The grammar HPSG (Sag and Wasow 1999) is well suited to the task of multilingual development of broad coverage grammars. HPSG is a constraint-based, lexicalist approach to grammatical theory that seeks to model human languages as systems of constraints on typed feature structures. In particular, the grammar adopts the mechanism of type hierarchy in which every linguistic sign is typed with appropriate constraints and hierarchically organized. The characteristic of such typed feature structure formalisms facilities the extension of grammar in a systematic and efficient way, resulting in a linguistically precise and theoretically motivated descriptions of Korean. In addition, we adopt a flat semantic formalism Minimal Recursion Semantics (MRS) in representing semantics (Copestake et al. 2001). MRS is proved to be flexible and well work with the Korean typed feature structures too. The basic tool for writing, testing and processing the KPSG is the LKB system (downloadable from http://www-csli.stanford.edu/ aac/lkb.html, Copestake 2002). The LKB system is a grammar and lexicon development environment for use with constraint-based linguistic formalisms such as HPSG.