| http://www.w3.org/ns/prov#value | - Past evidence of the user's comings and goings is logged over time that relates 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 based upon recent and/or current evide
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