The set of Objectsand related information that the OPC UA Servermakes available to Clientsis referred to as its AddressSpace. The model for Objectsis defined by the OPC UA Object Model (see 4.2).

Objects and their components are represented in the AddressSpaceas a set of Nodesdescribed by Attributesand interconnected by References. Figure 3illustrates the model of a Nodeand the remainder of 4.3 discusses the details of the Node Model.

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Figure 3– AddressSpace Node Model