Course 3

Grammar Implementation with Lexicalized Tree Adjoining Grammars and Frame Semantics
Laura Kallmeyer, Timm Lichte, Rainer Osswald & Simon Petitjean (Heinrich-Heine-Universität Düsseldorf)

There is growing consensus that formal and computational approaches to grammar modeling need to account for a smooth integration of lexical and constructional form-meaning components. The course will introduce a framework for grammar implementation that allows the specification and composition of syntactic and semantic structures in a flexible way. The framework combines Lexicalized Tree Adjoining Grammar (LTAG) with decompositional frame semantics. Elementary syntactic trees which represent the full argument projection of a lexical item are linked to semantic frames. An additional, “metagrammatical” level for constraint-based specifications allows a further decomposition of the elementary syntactic and semantic structures into more basic components, thereby giving rise to a highly modular grammar description.

The course starts with an overview of the TAG formalism and its variants, with a focus on its lexicalized version LTAG, followed by a brief introduction into frame-semantic representations and their logical specification. Then we will discuss various applications of LTAG enriched with frame semantics to the modeling of linguistic phenomena of different degrees of compositionality. The second part of the course will introduce the metagrammatical specification of grammar fragments, which will be supplemented by hands-on exercises using the XMG (eXtensible MetaGrammar) grammar writing system.

Background reading