| http://www.w3.org/ns/prov#value | - The 1st argument, id, is an IN argument, so you can pass any kind of expression (such as the literal 123) for that argument, just so long as the expression has the right data type.The 2nd argument, salary is an IN OUT argument, so you must pass a variable (such as s) for that argument.In the procedure you posted, the 2nd argument is not being used at all, but he is not necessarily wrong.
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