| http://www.w3.org/ns/prov#value | - For example, the input signal 102 may be generated by a user interface such as a button, switch, keyboard, mouse, software interface, graphical user interface, or other user interface, a sensor or transducer, or another source such as a database, network, World Wide Web, or other signal generator (e.g. email alert signal, financial data from the web).
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