Wikipedia
ConceptBase
ConceptBase (a.k.a. ConceptBase.cc) is a deductive and object-oriented database management system developed at University of Aachen and University of Skövde. It is mainly used for conceptual modeling and metamodeling in the domain of software engineering and related domains. ConceptBase.cc is free and open-source software.
ConceptBase combines the following features:
- Object-oriented concepts such as classes and inheritance
- Deductive rules evaluated by a Datalog engine
- Active rules conforming to the event condition action (ECA) paradigm
- Recursive function definitions
- Metamodeling with arbitrarily many abstraction levels (metaclasses, meta metaclasses)