Realizing the CDL Cross-Domain Language in the Ponder2 Policy Framework: Experiences and Research Directions

In this paper, we first present the design of the Cross-Domain Language (CDL), the first attempt to date to design a high-level end-user language for the specification of cross-domain information-release policies. We then discuss our experiences and lessons learned in implementing CDL policies on lower-level general-purpose language frameworks such as Ponder2 and highlight future directions for language design. CDL addresses the need for a high level, understandable and interoperable language targeted at policy management staff such as dissemination and release officers, security officers etc., as opposed to software developers. The ease of policy specification in CDL comes from the fact that policies are centered on the ontologies and metaphors of cross-domain information release. Combining this with the mature and time-tested features offered by general-purpose policy specification and execution environments such as Ponder2 will allow for the rapid prototyping of interoperable and efficient cross-domain solutions.