| http://www.w3.org/ns/prov#value | - Based on the specific rules stored on the real-time messaging server, the rules engine determines the state of various relevant conditions, such as the availability status of users of the system, and also detects the occurrence of various real-time events, such as a user logging-on to or logging-off from the system, in order to control the delivery of various types of messages and/or performance o
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