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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.7.4.5 SimpleAttributeOperand
  RelativePath are subtypes of HierarchicalReferences and the targets are Object or Variable Nodes and an Alias is not required . Table 129 defines the SimpleAttributeOperand type. Table 129 - SimpleAttributeOperand Name Type ... TypeDefinitionNode or one of its subtypes. If the SimpleAttributeOperand is used in an EventFilter and the typeDefinitionId is BaseEventType the Server shall evaluate the browsePath without considering the typeDefinitionId . browsePath