def new(self, tag_ident, tag_serial=0):
        # type: (int, int) -> None
        '''
        A method to create a new UDF Descriptor Tag.

        Parameters:
         tag_ident - The tag identifier number for this tag.
         tag_serial - The tag serial number for this tag.
        Returns:
         Nothing
        '''
        if self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF Tag already initialized')

        self.tag_ident = tag_ident
        self.desc_version = 2
        self.tag_serial_number = tag_serial
        self.tag_location = 0  # This will be set later.

        self._initialized = True
A method to create a new UDF Descriptor Tag.

        Parameters:
         tag_ident - The tag identifier number for this tag.
         tag_serial - The tag serial number for this tag.
        Returns:
         Nothing