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              Definition: | 
              Standing queries are subscribed to via the subscribe method. For each subscription, a SubscriptionControls instance defines how the query is to be processed.
  SubscriptionControls --- schedule : QuerySchedule // see Section 8.2.5.3 trigger : URI // specifies a trigger event known by the service initialRecordTime : Time // see Section 8.2.5.2 reportIfEmpty : boolean <<extension point>> | 
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