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From Contextual Grammars to Range Concatenation Grammars

https://doi.org/10.1016/S1571-0661(05)82573-3Get rights and content
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Abstract

Though the field of natural language processing is one of the major aims that has led to the definition of contextual grammars, very little was made on that subject. One reason is certainly the lack of efficient parsers for contextual languages. In this paper we show how some subclasses of contextual grammars can be translated into equivalent range concatenation grammars and can thus be parsed in polynomial time. However, on some other subclasses, this translation schema only succeeds if the range concatenation grammar formalism is extended. We show that the languages defined by such an extension may need an exponential parse time.

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