Annex B (informative) OPC UA Meta Model in UML ToC Previous Next

B.3 Meta Model ToC Previous Next

B.3.7 Variable and VariableType ToC Previous Next

Variable and VariableType are shown in Figure B.10.

readme_files/image052.png Figure B.10 – Variable and VariableType

The DataType of a Variable shall be the same as or a subtype of the DataType of its VariableType (referred with HasTypeDefinition).

If a HasProperty points to a Variable from a Base “A” then the following constraints apply:

  • The Variable shall not be the SourceNode of a HasProperty or any other HierarchicalReferences Reference.
  • All Variables having “A” as the SourceNode of a HasProperty Reference shall have a unique BrowseName in the context of “A”.

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