Annex Cdefines a graphical notation for OPC UA data. Annex Cis normative, that is, the notation is used in this document to expose examples of OPC UA data. However, it is not required to use this notation to expose OPC UA data.

The graphical notation is able to expose all structural data of OPC UA. Nodes, their Attributesincluding their current value and Referencesbetween the Nodesincluding the ReferenceTypecan be exposed. The graphical notation provides no mechanism to expose events or historical data.