Paper: Processing Unknown Words in HPSG

ACL ID P98-1014
Title Processing Unknown Words in HPSG
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 1998

The lexical acquisition system presented in this pa- per incrementally updates linguistic properties of un- known words inferred from their surrounding con- text by parsing sentences with an HPSG grammar for German. We employ a gradual, information- based concept of "unknownness" providing a uni- form treatment for the range of completely known to maximally unknown lexical entries. "Unknown" in- formation is viewed as revisable information, which is either generalizable or specializable. Updating takes place after parsing, which only requires a mod- ified lexical lookup. Revisable pieces of informa- tion are identified by grammar-specified declarations wlfich provide access paths into the parse feature structure. The updating mechanism revises the cor- responding places in the lexical feat...