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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.25.1 Overview
  ExtensibleParameter type is defined in 7.17 . There may be multiple notifications for a single MonitoredItem in a single NotificationData structure. When that happens the Server shall ensure the notifications appear ... same order that they were queued in the MonitoredItem . These notifications do not need to appear as a contiguous block. Table 160 - NotificationData parameterTypeIds Symbolic Id Description DataChange Notification data