9. The data converting apparatus according to claim 8 , wherein the metadata is described by an element selected from among a data type of the data to be converted, a type attribute of the data type, and a value of the type attribute, and in the encoded meta-definition information, a priority sequence of the data type and the type attribute are set with respect to the conversion rule code.
11. The data converting apparatus according to claim 9 , wherein the detecting unit executes the detecting process for the data type first and executes the detecting process in reverse order of the priority of the conversion rule of the type attribute.