tailieunhanh - Báo cáo khoa học: "PARADIGMATIC MORPHOLOGY"

We present a notation for the declarative statement of morphological relationships and lexieal rules, based on the traditional notion of Word and Paradigm (cf Hockett 1954). The phenomenon of blocking arises from a generalized version of Kiparsky's (1973) Elsewhere Condition, stated in terms of ordering by subsumption over paradigms. Orthographic constraints on morphemic alternation are described by means of string equations (Siekmann 1975). We indicate some criticisms to be made of our approach from both linguistic and computational perspectives and relate our approach to others such as Finite-State Morphology (Koskenniemi 1983), DATR (Gazdar and Evans 1989) and object-oriented morphophonemics. | PARADIGMATIC MORPHOLOGY Jonathan Calder University of Edinburgh Centre for Cognitive Science 2 Buccleuch Place Edinburgh Scotland EH8 9LW ABSTRACT We present a notation for the declarative statement of morphological relationships and lexical rules based on the traditional notion of Word and Paradigm cf Hockett 1954 . The phenomenon of blocking arises from a generalized version of Kiparsky s 1973 Elsewhere Condition statedin terms of ordering by subsumption over paradigms. Orthographic constraints on morphemic alternation are described by means of sưing equations Siekmann 1975 . We indicate some criticisms to be made of our approach from both linguistic and computational perspectives and relate our approach to others such as Finite-State Morphology Koskenniemi 1983 DATR Gazdar and Evans 1989 and object-oriented morphophonemics de Smedt 1984 Daelemans 1988 . Finally we discuss the questions of whether a system involving suing equations allows a reduction to finite-state techniques. 1 Introduction A common assumption in linguistics is that the phonological morphological and orthographic statements are most appropriately phrased in a fundamentally procedural way see for example Hoeksma and Janda 1988 . Morphological analysis under the rubric of finite-state morphology Koskenniemi 1983 has arguably tended to support the view that morphological alternation is best described by stating procedures for the destructive alteration of orthographic units. At the very least it appears to have led to the view that morphological descriptions should be restticted to those with an immediate interpretation in terms of the operations of finite-state transducers. In this paper we present a notation for the declarative statement of morphological relationships and lexical rules based on the traditional notion ol Word and Paradigm WP Hockett 1954 see alsc Anderson 1982 . The phenomenon of blocking arises from a generalized version of Kiparsky s 1973 Elsewhere Condition stated in terms of