If an ObjectType, VariableType, DataType, or ReferenceType is used in an OPC UA FX Information Model that is not defined in the libraries listed in Annex B, Annex C, Annex D, and Annex E, a definition of the object type, variable type, data type, or reference type shall exist in an OPC UA FX Library, and this library shall be included in the Descriptor. The OPC UA FX AML Core Libraries are those libraries defined in this document.

For modelling of safety information for a Descriptor, the OPC UA FX AML Safety library shall be used (see Annex E).