code: def create_relational(cls, name, inst):
          
          return Attribute(
              javabridge.make_instance(
                  "weka/core/Attribute", "(Ljava/lang/String;Lweka/core/Instances;)V", name, inst.jobject))
docs: Creates a relational attribute.
  
          :param name: the name of the attribute
          :type name: str
          :param inst: the structure of the relational attribute
          :type inst: Instances