# File lib_ctrl/rucy/params.rb, line 1056
    def save(properties)
      for entry in @list
        path = entry['mount_path']
        case (path)
        when String
          if (path !~ %r"^/") then
            raise "not allowed path: #{path.inspect}"
          end
        when NilClass
          raise 'required mount path'
        end
      end
      properties.set_list('documents', @list)
      nil
    end