| http://www.w3.org/ns/prov#value | - For example, if x is a local variable and y is a pass-by-reference parameter, computing x+1 and y+1 may (depending on the details of your interpreter) work differently: in the former, you just look up the value of x, and then add one to it; in the latter, you must look up the reference that y happens to be bound to in the environment and go look what value is stored in the variable on the far side
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