code: def set_readable_web_pdf(self, value):
          ''' setter '''
          if isinstance(value, ReadableWebPDF) is False and value is not None:
              raise TypeError("The type of __readable_web_pdf must be ReadableWebPDF.")
          self.__readable_web_pdf = valuf set_readable_web_pdf(self, value):
          ''' setter '''
          if isinstance(value, ReadableWebPDF) is False and value is not None:
              raise TypeError("The type of __readable_web_pdf must be ReadableWebPDF.")
          self.__readable_web_pdf = value
docs: setter