In the literature, there exist already many languages for declarative process modeling. Each language addresses only one specific business concern. In our work, we define a unified framework for declarative process modeling, consisting of a unified vocabulary, execution model, and business rule types . It can be used both as an expressive informal language for documenting business concerns, and as an ontological foundation to compare and develop declarative languages.
Goedertier, Stijn and Vanthienen, Jan, "Declarative Process Modeling with Business Vocabulary and Business Rules" (2008). EIS 2008 Proceedings. 6.