caa a22 4500 477066968 CHVBK 20180405111415.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00593039 doi (NATIONALLICENCE)springer-10.1007/BF00593039 Order independent and persistent typed default unification [Elektronische Daten] [Alex Lascarides, Ted Briscoe, Nicholas Asher, Ann Copestake] 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. Kluwer Academic Publishers, 1995 Lascarides Alex University of Edinburgh Centre for Cognitive Science and Human Communication Research Centre 2, Buccleuch Place, E118 9LW, Edinburgh, Scotland, United Kingdom aut Briscoe Ted Institute for Research in Cognitive Science University of Pennsylvania, Pennsylvania aut Asher Nicholas Department of Philosophy, University of Texas, 78712, Austin, TX, USA aut Copestake Ann Computer Laboratory, University of Cambridge, Cambridge aut Linguistics and Philosophy Kluwer Academic Publishers; gopher://gopher.wkap.nl 19/1(1996-02-01), 1-90 0165-0157 19:1<1 1996 19 10988 https://doi.org/10.1007/BF00593039 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00593039 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lascarides Alex University of Edinburgh Centre for Cognitive Science and Human Communication Research Centre 2, Buccleuch Place, E118 9LW, Edinburgh, Scotland, United Kingdom aut NATIONALLICENCE 700 1- Briscoe Ted Institute for Research in Cognitive Science University of Pennsylvania, Pennsylvania aut NATIONALLICENCE 700 1- Asher Nicholas Department of Philosophy, University of Texas, 78712, Austin, TX, USA aut NATIONALLICENCE 700 1- Copestake Ann Computer Laboratory, University of Cambridge, Cambridge aut NATIONALLICENCE 773 0- Linguistics and Philosophy Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 19/1(1996-02-01), 1-90 0165-0157 19:1<1 1996 19 10988 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer