| http://www.w3.org/ns/prov#value | - Actions can generally produce at least the following different types of output that are sent to the backend: (1) strings that are forwarded by the backend to the frontend (these strings may be displayed by the frontend in a graphical widget); (2) commands that update the value of a backend counter; and (3) commands that are intended to change the execution or state of the target program.
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