Routledge Dictionary of Language and Linguistics
A rule of transformational grammar of the type X→Y1…Yn, where the element to the left of the arrow, X, can be replaced by the elements to the right of the arrow.
These rules correspond to the branching in tree diagrams (
phrase structure rules). There is a difference between context-free rewrite rules and context-sensitive rewrite rules. For example V →V transitive/#NP is a context-sensitive rule, where/means ‘in the environment of and # the empty space where the transposed element will be placed.
References
transformational grammar
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