Abstract
This work presents results on the integration of frame-based representations into the framework of eXtensible MetaGrammar (XMG). Originally XMG allowed for the description of tree-based syntactic structures and underspecified representations of predicate-logical formulae, but the representation of frames as a sort of typed feature structure, particularly type unification, was not supported. Therefore, we introduce an extension that is capable of handling frame representations directly by means of a novel <frame>-dimension. The aim is not only to make possible a straightforward specification of frame descriptions, but also to offer various ways to specify constraints on types, be it as a contiguous type hierarchy or a loose set of feature structure constraints. The presented extensions to XMG are fully operational in a new prototype.
Highlights
Recent work (Kallmeyer and Osswald 2012a,b, 2013; Zinova and Kallmeyer 2012) has shown increasing interest in coupling a framebased semantics with a tree-based syntax such as Tree Adjoining Grammar (TAG, Joshi and Schabes 1997)
We extend XMG by a novel -dimension, among other tools, that makes it capable of handling frame representations as formalized in Petersen (2007) and Kallmeyer and Osswald (2013), i.e. as extended typed feature structures, directly.3. This capability paves the way for implementing recent work on morphological decomposition, such as in Zinova and Kallmeyer (2012), where morphemes are linked to a frame-semantic representation. These efforts might seem redundant, given that there exists a multitude of works on dealing with typed feature structures in grammar implementation and parsing, notably in the framework of HPSG (e.g. Carpenter 1992; Götz et al 1997; Malouf et al 2000; Flickinger 2000; Copestake 2002; Carpenter et al 2003)
We hypothesize that other frameworks are mainly concerned with the syntactic component of the grammar, while we focus on the conceptual semantics whose structure seems to be much less predetermined
Summary
This work presents results on the integration of frame-based representations into the framework of eXtensible MetaGrammar (XMG). We extend XMG by a novel -dimension, among other tools, that makes it capable of handling frame representations as formalized in Petersen (2007) and Kallmeyer and Osswald (2013), i.e. as extended typed feature structures, directly.. We extend XMG by a novel -dimension, among other tools, that makes it capable of handling frame representations as formalized in Petersen (2007) and Kallmeyer and Osswald (2013), i.e. as extended typed feature structures, directly.3 This capability paves the way for implementing recent work on morphological decomposition, such as in Zinova and Kallmeyer (2012), where morphemes are linked to a frame-semantic representation.
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