12. The apparatus according to claim 11 wherein the label identifies a data type, and wherein the apparatus is further caused to perform: store more than one data type in the differential store wherein the differential store is partitioned, each partition accommodating data having a different value for the label.
12. The apparatus according to claim 11 wherein the label identifies a data type, and wherein the apparatus is further caused to perform: store more than one data type in the differential store wherein the differential store is partitioned, each partition accommodating data having a different value for the label. 15. The apparatus according to claim 12 wherein the number of partitions is dynamically variable.