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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def record(self):
        # type: () -> bytes
        '''
        A method to generate the string representing this UDF Logical Volume
        Integrity Descriptor.

        Parameters:
         None.
        Returns:
         A string representing this UDF Logical Volume Integrity Descriptor.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF Logical Volume Integrity Descriptor not initialized')

        rec = struct.pack(self.FMT, b'\x00' * 16,
                          self.recording_date.record(), 1, 0, 0,
                          self.logical_volume_contents_use.record(), 1,
                          self.length_impl_use, self.free_space_table,
                          self.size_table,
                          self.logical_volume_impl_use.record())[16:]
        return self.desc_tag.record(rec) + rec