Maintaining the Forest and Burning out the Underbrush in XTAG
Christine Doran, Beth Ann Hockey, Philip Hopely, Joseph Rosenzweig, Anoop Sarkar, Srinivas Bachu, Fei Xia · 1997
In this paper we report on the recent advancements and current status of the XTAG Project, housed at the University of Pennsylvania. We discuss the current coverage of the system, as evaluated on the TSNLP English sentences, hierarchical organization of the grammar, and the new and more portable implementation of the X-interface to the grammar and all of the supporting tools in CLISP, which is freely available. We also present a methodology for specializing our grammar to a particular domain, and give some results on this effort. 1 Development and Current Status of XTAG 1.1 History of XTAG The XTAG project has been ongoing at Penn in some form or another since 1988. It began with a toy grammar run on LISP machines, and currently has a large English grammar, small grammars in several other languages, a sophisticated X-windows based grammar development environment and numerous satellite tools. Approximately 35 people have worked extensively on the system, and at least that many have w...