def set_label(name, reference_id)
      label = label_class.new id: name, reference_id: reference_id

      object_store.store name, label
    end
def set_label(name, reference_id)
      label = label_class.new id: name, reference_id: reference_id

      object_store.store name, label
    end
Create a label (named object) pointing to `reference_id`

 If the label already exists it is overriden.