% % GENERATED FROM https://www.coli.uni-saarland.de % by : anonymous % IP : coli2006.lst.uni-saarland.de % at : Mon, 05 Feb 2024 15:43:09 +0100 GMT % % Selection : Reference #687 % @InCollection{Kiefer_Krieger:2001, AUTHOR = {Kiefer, Bernd and Krieger, Hans-Ulrich}, TITLE = {A Context-Free Approximation of Head-Driven Phrase Structure Grammar}, YEAR = {2001}, BOOKTITLE = {Efficiency in Unification-Based Processing}, PUBLISHER = {CSLI Lecture Notes}, ABSTRACT = {We present a context-free approximation of unification-based grammars, such as HPSG or PATR-II. The theoretical underpinning is established through a least fixpoint construction over a certain monotonic function. In order to reach a finite fixpoint, the concrete implementation can be parameterized in several ways, either by specifying a finite iteration depth, by using different restrictors, or by making the symbols of the CFG more complex adding annotations à la GPSG. We also present several methods that speed up the approximation process and help to limit the size of the resulting CF grammar.} }