code: static String getNativeDataTypeName( int nativeDataTypeCode ) 
          throws OdaException
      {
          DataTypeMapping typeMapping = 
                              getManifest().getDataSetType( null )
                                  .getDataTypeMapping( nativeDataTypeCode );
          if( typeMapping != null )
              return typeMapping.getNativeType();
          return "Non-defined"; 
      }
docs: Returns the native data type name of the specified code, as
  defined in this data source extension's manifest.
  @param nativeTypeCode    the native data type code
  @return                  corresponding native data type name
  @throws OdaException     if lookup fails