US Patent 9864752 Multilayer policy language structure

A policy language for an information management system has a three-layer structure that allows specifying one or more policies using policy abstractions. The policies and policy abstractions are in two different layers and decoupled from one another, so policies and policy abstractions may be specified and altered separately from each other. A third layer includes entity objects. A policy may refer to any number of policy abstractions. Multiple policies may reference a single policy abstraction, and a change to that policy abstraction will result in multiple policies being changed. Further, policy abstractions may be nested, so one policy abstraction may reference another policy abstraction, and so forth.