code: def _make_publisher(catalog_or_dataset):
      
      level = catalog_or_dataset
      keys = [k for k in ["publisher_name", "publisher_mbox"] if k in level]
      if keys:
          level["publisher"] = {
              key.replace("publisher_", ""): level.pop(key) for key in keys
          }
      return level
docs: De estar presentes las claves necesarias, genera el diccionario
      "publisher" a nivel catálogo o dataset.