The Head-Driven Phrase Structure Grammar (HPSG) is a grammar theory developed by Pollard and Sag (1985). It uses a uniform formalism and is organized in a modular way which makes it attractive for Natural language processing.
... of Ottawa
Bibliography
Hogg, P. W., Constitutional law of Canada 4th ed. (Carswell: Scarborough) with Supplement to Constitutional Law of Canada (2002-) ...