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Linearization-based HPSG theories are widely used for analyzing languages with relatively free constituent order. This paper introduces the Generalized ID/LP (GIDLP) grammar format, which supports a direct encoding of such theories, and discusses key aspects of a parser that makes use of the dominance, precedence, and linearization domain information explicitly encoded in this grammar format. We show that GIDLP grammars avoid the explosion in the number of rules required under a traditional phrase structure analysis of free constituent order. As a result, GIDLP grammars supportmore modular and compact grammar encodings and require fewer edges in parsing.
(Ingria 1990)'s claims that both feature neutrality, where a sign acts in a sentence as though it simultaneously had multiple values for a single feature, and the coordination of unlike categories, where the features of two or more conjuncts differ from each other, pose fundamental problems for unification-based theories of grammar do not apply to constraint-based theories like HPSG.
New types can be introduced into the hierarchy of appropriate values for any given feature that directly represent neutralizations and coordinations. In this manner, feature neutralization and the coordination of unlikes are seen to be different aspects of the same problem: how to determine the values of a coordinate mother's features from those of its conjuncts.