Routing Policy Specification Language

Developed by the Internet Engineering Task Force, the Routing Policy Specification Language (RPSL) is a means of describing abstract routing policy among autonomous systems (AS), the basic building block of global Internet routing. It allows both the definition of policies for the carrying out of business or other goals, but it also has sufficiently fine detail to allow the automatic generation of router configuration language from RPSL descriptions.

While it is not a programming language, it can describe relationships among sets of AS, individual AS, and among routers inside an AS. It is object-oriented.