20. The data converting apparatus according to claim 19 , further comprising a compensating unit that compensates skipped metadata specified as default in the meta-definition information, when metadata in a lower hierarchy of given metadata defined in the specification definition information is specified as default, wherein the generating unit generates, for each metadata in the meta-definition information compensated by the compensating unit, encoded meta-definition information by assigning and encoding a conversion rule code specific to the conversion rule table related to the metadata.
19. The data converting apparatus according to claim 14 , further comprising: a meta-definition information acquiring unit that acquires meta-definition information that defines metadata for the conversion source and for the conversion destination; and a generating unit that, for each of the metadata in the meta-definition information acquired by the meta-definition information acquiring unit, generates the encoded meta-definition information by assigning and encoding a conversion rule code specific to the conversion rule table related to the metadata.