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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.11.5 StatusCode assigned to a value
  means that the quality of the value is uncertain for reasons indicated by the SubCode . A StatusCode with severity Bad means that the value is not usable for reasons indicated ... SubCode . Rules The StatusCode indicates the usability of the value. Therefore, It is required that Clients minimally check the StatusCode Severity of all results, even if they do not check
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.5.4 DataSetMessage header
  bits of the StatusCode DataType representing the numeric value of the Severity and SubCode of the StatusCode DataType . The field shall be omitted if Bit 4 of DataSetFlags1 is false