| http://www.w3.org/ns/prov#value | - The amount of time a user is expected return or remain present can be utilized in guiding messaging decisions, for example, in deciding whether a message or appointment request should be sent to a user's pager or cell phone, given the amount of time a user is expected to be away from a message location, the identity of the sender, and, more generally, the sensed or inferred urgency of the message.
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