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• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  4.4.4 References
  References are used to relate Nodes to each other. They can be accessed using the browsing and querying Services defined in OPC 10000-4 . Like Attributes , they are defined ... Attributes , References are defined as instances of ReferenceType Nodes . ReferenceType Nodes are visible in the AddressSpace and are defined using the ReferenceType NodeClass (see 5.3 ). The Node that contains the
• OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access
  A.3.1.3 Item
  A.3.1.3 Item DA items (leafs) are represented in the COM UA Wrapper as Variables . The VariableType depends on the existance of special DA properties as follows: AnalogItemType : An item ... the DA server that has High EU and Low EU properties or its EU Type property is Analog is represented as Variable of AnalogItemType in the COM UA Wrapper. The
• OPC-10000-80 – OPC Unified Architecture - Part 80: UAFX Overview and Concepts
  3.1.13 FunctionalEntity
  FunctionalEntity element of an AutomationComponent containing the data and methods needed to configure, control and manage functional behaviour Note 1 to entry: See OPC 10000-81 for a description ... the FunctionalEntityType