12. The method of claim 10 , wherein each access method is selected from at least two different access method types; wherein each of the different access methods types defines a different manner of exposing the physical data corresponding to the logical field name of the respective logical field definition.
12. The method of claim 10 , wherein each access method is selected from at least two different access method types; wherein each of the different access methods types defines a different manner of exposing the physical data corresponding to the logical field name of the respective logical field definition. 15. The method of claim 12 , wherein the different access methods types include at least a simple access method type and a composed access method type; wherein simple access methods map a corresponding logical field name, of a respective logical field definition, directly to a particular physical data field of the physical data; and wherein composed access methods, of respective logical field definitions, define an expression for the respective logical definitions, the expression being defined on the basis of a different logical field definition.