The types and instances defined in this document are illustrated in Figure 1. The DictionaryEntryTypeis an abstract base type for dictionary entries. The IrdiDictionaryEntryTypeand the UriDictionaryEntryTypeprovide concrete types that can be used to represent dictionary entries. The HasDictionaryEntry ReferenceTypeis used to refer an OPC UA Nodeto a dictionary entry. The DictionaryFolderTypeand the Dictionaries Objectprovide an optional capability to expose the hierarchy of a referenced dictionary.

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Figure 1– The dictionary reference types