ConceptBase
[Image:Cb-metamodel-erd.png|thumb|200px| All 4 MOF levels for Entity-Relationship Diagrams displayed in the ConceptBase Graph Editor]
ConceptBase is a deductive and object-oriented database management system developed at University of Skövde. Earlier development was done at University of Passau, University of Aachen, and University of Tilburg. 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 paradigm
- Recursive function definitions
- Metamodeling with arbitrarily many abstraction levels
a variant of the knowledge representation Telos.
The graphical user interface consists of a workbench to add new classes & objects and a highly configurable graph editor. The graphical types of nodes and linked can be defined via deductive rules, i.e. they can be context-specific.