| http://www.w3.org/ns/prov#value | - resence awareness policy, reciprocal permission, may say that j can invite i when i's door is closed given that i can invite j; a similar policy can be specified for finding out real names instead of pseudonyms.For these user activities, the user interface sends out the following kinds of messages to the rest of the system: set(door(open)), set(door(closed)), set(ExceptionRule)The collaborative in
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