3. The method of claim 1 , wherein the definition file includes an attribute section including a numeric value indicating a number of attribute values of the data object.
3. The method of claim 1 , wherein the definition file includes an attribute section including a numeric value indicating a number of attribute values of the data object. 4. The method of claim 3 , wherein the database table includes: a unique name of a predetermined format, the unique name indicating a storage location of the definition file; and a column, wherein the mapping between the definition file and the database table is performed by linking the attribute section and the column, and wherein the imported attribute is included in the column.