Systems, methods and computer program products are provided for data processing. In one implementation, a data processing system is provided that comprises storage means for storing a data category definition table. The data category definition table may include at least the following entries for each data category: a unique name of the data category, a data table identifier for identification of a data table storing data sets of the data category, and a data structure table identifier for identification of a data structure table storing key field and data field names of the data table.