1. A method of managing information comprising: providing a plurality of rules and a plurality of abstractions, wherein a rule comprises an expression having a variable, and the variable is defined in a first abstraction; determining a subset of the plurality of rules and abstractions relevant to a target; modifying the subset of rules and abstractions, wherein the modified subset of rules and abstractions are logically equivalent to the subset of rules and abstractions; associating the modified subset of rules and abstractions to the target; and for the target, controlling access to the information based on the modified subset of rules and abstractions.