In
computer science and
linguistics, a formal grammar, or sometimes simply grammar, is a precise description of a
formal language — that is, of a
set of
strings over some
alphabet. The two main categories of formal grammar are that of generative grammars, which are sets of rules for how strings in a language can be generated, and that of analytic grammars, which are sets of rules for how a string can be analyzed to determine whether it is a member of the language. In short, an analytic grammar describes how to recognize when strings are members in the set, whereas a generative grammar describes how to write only those strings in the set.
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