Computer Science – Computation and Language
Scientific paper
1998-09-25
Proceedings COLING-ACL'98, vol.I, 91-95
Computer Science
Computation and Language
5 pp., 1 PostScript figure
Scientific paper
The lexical acquisition system presented in this paper incrementally updates linguistic properties of unknown words inferred from their surrounding context by parsing sentences with an HPSG grammar for German. We employ a gradual, information-based concept of ``unknownness'' providing a uniform treatment for the range of completely known to maximally unknown lexical entries. ``Unknown'' information is viewed as revisable information, which is either generalizable or specializable. Updating takes place after parsing, which only requires a modified lexical lookup. Revisable pieces of information are identified by grammar-specified declarations which provide access paths into the parse feature structure. The updating mechanism revises the corresponding places in the lexical feature structures iff the context actually provides new information. For revising generalizable information, type union is required. A worked-out example demonstrates the inferential capacity of our implemented system.
Barg Petra
Walther Markus
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