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OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model8.51 StructureFieldIf the structureType is StructureWithSubtypedValues , or UnionWithSubtypedValues and the isOptional field is TRUE then the encoding of the field shall be able to transport any subtype of the DataType ... specifies the maximum supported length in bytes. If the maximum is unknown the value shall be 0. If the dataType field is not a String or ByteString the value shall