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Prefix grammar
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In [[theoretical computer science]] and [[formal language theory]], a '''prefix grammar''' is a type of [[string rewriting system]], consisting of a set of [[string (computer science)|string]] [[rewriting]] rules, and similar to a [[formal grammar]] or a [[semi-Thue system]]. What is specific about prefix grammars is not the shape of their rules, but the way in which they are applied: only [[prefix (computer science)|prefixes]] are rewritten. The prefix grammars describe exactly all [[regular language]]s.<ref>[http://portal.acm.org/citation.cfm?id=185820 M. Frazier and C. D. Page. Prefix grammars: An alternative characterization of the regular languages. Information Processing Letters, 51(2):67β71, 1994.]</ref>
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