code: @Override
      protected OBDASpecification loadOBDASpecification() throws OBDASpecificationException {
          return loadSpecification(
                  Optional::empty,
                  Optional::empty,
                  Optional::empty,
                  Optional::empty,
                  Optional::empty,
                  Optional::empty
                  );
      }
docs: Can be overloaded.
  However, the expected usage is to use the other method loadSpecification(...).