Order independent and persistent typed default unification

Linguistics and Philosophy 19 (1):1 - 90 (1996)
Nicholas Asher
Centre National de la Recherche Scientifique
We define an order independent version of default unification on typed feature structures. The operation is one where default information in a feature structure typed with a more specific type, will override default information in a feature structure typed with a more general type, where specificity is defined by the subtyping relation in the type hierarchy. The operation is also able to handle feature structures where reentrancies are default. We provide a formal semantics, prove order independence and demonstrate the utility of this version of default unification in several linguistic applications. First, we show how it can be used to define multiple orthogonal default inheritance in the lexicon in a fully declarative fashion. Secondly, we show how default lexical specifications (introduced via default lexical inheritance) can be made to usefully persist beyond the lexicon and interact with syntagmatic rules. Finally, we outline how persistent default unification might underpin default feature propagation principles and a more restrictive and constraint-based approach to lexical rules.
Keywords No keywords specified (fix it)
Categories (categorize this paper)
DOI 10.1007/BF00593039
Edit this record
Mark as duplicate
Export citation
Find it on Scholar
Request removal from index
Revision history

Download options

Our Archive

Upload a copy of this paper     Check publisher's policy     Papers currently archived: 36,570
Through your library

References found in this work BETA

Lexical Semantics.D. A. Cruse - 1986 - Cambridge University Press.
Semi-Productive Polysemy and Sense Extension.Ann Copestake & Ted Briscoe - 1995 - Journal of Semantics 12 (1):15-67.

View all 9 references / Add more references

Citations of this work BETA

Add more citations

Similar books and articles


Added to PP index

Total downloads
33 ( #197,514 of 2,303,699 )

Recent downloads (6 months)
11 ( #47,901 of 2,303,699 )

How can I increase my downloads?

Monthly downloads

My notes

Sign in to use this feature