| http://www.w3.org/ns/prov#value | - In a system for processing commands entered by a user, the commands including expressions which resolve to a result, a method comprising:(a) receiving input from the user specifying a desired expression; (b) dividing said input into a plurality of tokens, said plurality of tokens including at least one operator token and at least one operand token; (c) determining validity of said desired expressi
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