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OPC-10000-211 – OPC Unified Architecture - Part 211: Global Positioning4.2.3.1 Conceptswhich can be accessed with standard services. These Objects consist of Nodes connected by References. Different classes of Nodes convey different semantics. For example, a Variable Node represents a value ... restrict it to a float. Figure 3 - The relationship between Type Definitions and Instances References allow Nodes to be connected in ways that describe their relationships. All References have