«takes as input a sequence of phrase-structure trees and modifies their labels according to a set of rules. ... Its rule notation is flexible enough to emulate head/argument-finding rules»
M. Hearne, S. Ozdowska, and J. Tinsley. Actes de la 15e Conférence Annuelle sur le Traitement Automatique des Langues Naturelles (TALN '08), Avignon, France, ATALA, (2008)