n.(CS-rule) (more fully, context-sensitive phrase structure rule, or CS-PS-rule) A rewrite rule which expands exactly one category into an ordered string of one or more categories and for the application of which some environment is specified. An abstract example is the rule ABC/ ___ D, meaning that a category A which is immediately followed by the category D can be expanded into the string B C; this rule cannot be applied to instances of A not immediately followed by D. Such rules are little used in syntax, but the mechanism typically used for lexical insertion in TG and GB is equivalent to the use of CS-rules; for example, the subcategorization frame for the verb give in these frameworks could be represented as Vgive/ _____ NP NP, meaning that give can be inserted into a V node immediately followed by two NPs.
The ban on null productions is relaxed in some conceptions. The interpretation of CS-rules as local subtrees requires some care; see node admissibility condition, and see the discussion in Partee et al. (1990). Cf. context-free rule.
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BC/ ___ D, meaning that a category A which is immediately followed by the category D 
give/ _____ NP NP, meaning that give can be inserted into a V node immediately followed by two NPs. 
