| http://www.w3.org/ns/prov#value | - For example, a user may specify that a message of high urgency should be transmitted with an alert to one or more active devices as soon as possible and to be available for review if the user happens to inspect the waiting messages, but if the user is more than some level of non-interruptability during that time and the message has not been seen or observed, to wait at most 30 minutes or other tim
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