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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.25.2 DataChangeNotification parameter
  detected; if the MonitoringMode is set to SAMPLING, the MonitoredItem is linked to a triggering item and the triggering item triggers. See 5.13 for a description of the MonitoredItem Service ... particular the MonitoredItem model and the Triggering model. After creating a MonitoredItem, the current value or status of the monitored Attribute shall be queued without applying the filter