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We state in 3.1.2 "At evaluation time, the value of a variable reference is the value of the expression to which the relevant variable is bound". However, we have a number of constructs that associate a value with a variable by means other than evaluating an expression: examples are the positional variable in a for clause, the various window variables, and the variables in group-by.
I'm changing this to: "the value to which the relevant variable is bound".