#include "expr.h"
#include "clause.h"
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Created: Fri Apr 25 11:52:17 2003
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A data structure representing a variable in the search engine. It is a smart pointer with a uniquifying mechanism similar to Expr, and a variable is uniquely determined by its expression. It can be thought of as an Expr with additional attributes, but the type is different, so it will not be confused with other Exprs.
Definition in file variable.h.