Extending a Policy Language in a Structured way using Model Driven Techniques

Policy languages have been used for a variety of applications in software systems - usually each application has received its own language. An example of a policy language that has been designed with domain specialization in mind is APPEL, however so far no structured way for domain specialization has been designed. In this paper we use model driven design techniques, in particular parameterization, to present a framework for providing said structured way for adopting/extending APPEL to a specific domain. We exemplify the approach with a case study.