| http://www.w3.org/ns/prov#value | - For example, past evidence of the user's comings and goings can be logged over time that relate to the presence and/or other states of the user (e.g., availability to communicate now via one or more forms of channels of communication, goals, attention/focus), wherein a probability model may be constructed to predict the amount of time it may take for the user's likely return, expected arrival or c
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