67. The method of claim 63 , wherein the plurality of data tunnels and respective operators relate to instances of an entity type wherein distinct instances of said entity type differ in structure.
67. The method of claim 63 , wherein the plurality of data tunnels and respective operators relate to instances of an entity type wherein distinct instances of said entity type differ in structure. 70. The method of claim 67 , wherein a plurality of the data tunnels are characteristic data tunnels, and the plurality of characteristic data tunnels and respective operators relate to instances of an entity type wherein distinct instances of said entity type differ in structure.