    def find_from_format(id: nil, string: nil, ext: nil)
      if id.present?
        find_from_format_by_id(id)
      elsif ext.present?
        find_from_format_by_ext(string, ext: ext)
      elsif string.present?
        find_from_format_by_string(string)
      else
        "datacite"
      end
    end