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• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  9.32.4 Event compression
  Event compression An implementation is not required to issue an Event for every update as it occurs. An OPC UA Server may be capable of grouping a series of transactions ... series, to cover all of the changes. This is referred to as Event compression . A change in the NodeVersion and the ViewVersion may thus reflect a group of changes