Simon Petitjean

Implementing semantic frames as typed feature structures with XMG

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 -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.

Describing Music with MetaGrammars

This paper aims to show that metagrammars are not only suited for the development of large scale grammars for natural languages, but can also deal with other types of resources. We give the example of some elementary music phenomena, that can be quite naturally described within the modular scope offered by eXtensible MetaGrammar.