ParameterTypeEnum is an enumerated list of parameter datatypes.

This enumerated datatype is used by the input datatype, ParameterSpecificationInput, which is used by the datatype, CreateOrUpdateExternalFunctionInput, which is used by the createOrUpdateExternalFunction() mutation field.

This enumerated datatype is also used by the datatype, ParameterSpecificationOutput, which is used by the datatype, ExternalFunctionSpecificationOutput, which is also used by the createOrUpdateExternalFunction(), as well as the getExternalFunction() query field.