Rewrite rule
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For rewriting rule in a formal grammar, see Production (computer science). For the use of "rewrite rules" in web servers, see rewrite engine.
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In linguistics, a rewrite rule for natural language (phrase structure rule, analog of production in formal grammars) in generative grammar is a rule of the form A → X where A is a syntactic category label, such as noun phrase or sentence, and X is a sequence of such labels and/or morphemes, expressing the fact that A can be replaced by X in generating the constituent structure of a sentence.
Example:
S → NP VP
Which means: Sentence consists of Noun Phrase followed by Verb Phrase.
Rewrite rules underlie rewriting systems; there are many different varieties of rewriting systems that are commonly studied.
[edit] See also
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