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• OPC-10000-11 – OPC Unified Architecture - Part 11: Historical Access
  5.1.2 Annotations Property
  Annotations O Annotation The Annotations Property is used to indicate that the history collection exposed by a HistoricalDataNode supports Annotation data. Annotation DataType is defined in 6.6.6 . ConformanceUnits Historical Access ... available for DataVariables or Objects . The Annotations Property shall be present on every HistoricalDataNode that supports modifications, deletions, or additions of Annotations whether or not Annotations currently exist. Annotation data