Parse :attr:`raw_data`.

        Returns:
            MetadataFile: New MetadataFile with parsed data inside (namedtuples
                          are immutable).

def _parse(self):
        """
        Parse :attr:`raw_data`.

        Returns:
            MetadataFile: New MetadataFile with parsed data inside (namedtuples
                          are immutable).
        """
        return MetadataFile(
            self.filename,
            self.raw_data,
            decoders.parse_meta(self.filename, self.raw_data)
        )