NorSource - Norwegian HPSG Resource Grammar

NorSource - A short description

The NorSource Grammar, started in 2002, is a computational grammar for Norwegian developed at NTNU, Trondheim. It forms part of the activities of the research group LingLab@ntnu, with Lars Hellan, Dorothee Beermann and Ben Waldron as its current developers. NorSource is based on the linguistic framework HPSG ('Head-Driven Phrase Structure Grammar') (cf. (Pollard and Sag 1994), (Sag, Wasow and Bender 2003)), and uses the grammar engineering platform LKB ('Linguistic Knowledge Builder') (cf. (Copestake 2002)). As part of a multilingual grammar engineering sub-project of the EU project Deep Thought (2002-2004), NorSource enjoyed a cooperative environment from its inception, an environment currently constituted by the consortium DELPH-IN. Like other DELPH-IN grammars, NorSource performs both parsing and generation. Its main type of parsing output are semantic representations on the format of Minimal Recursion Semantics (MRS; cf. Copestake et al. 2005); these representations are exportable in XML format to other applications.

A first development of NorSource is described in (Hellan 2003) and (Hellan and Haugereid 2003), a second development in (Beermann and Hellan 2004), and a third in (Hellan and Beermann 2005a and 2006). Both of the latter developments constitute shifts to a more semantic grounding of the grammar. Further presentations of various aspects of the grammar are (Hellan and Beermann 2005b), (Hellan 2006), and for its use in an application, (Beermann, Gulla, Hellan and Prange 2004). A demo interface for the grammar is found on this site, displaying MRS representations and analysis trees for sentences of one's choice.

Currently NorSource is being related to applications such as Machine Translation and Knowledge Base Querying. It utilizes standard facilities available in the DELPH-IN consortium such as the fast processing platform PET, treebanking facilities using tsdb, annotation and preprocessing mechanisms, lexical databasing, and others. It also serves as background for an attempt at modularizing grammatical specification, and attaining a multilingually standardizable system of type and construction labels (cf. Hellan 2007, 2008).

LAST UPDATED November 2008 - Dorothee Beermann