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G. Gottlob, O. Orsi, A. Pieris:
"Consistency Checking of Re-engineered UML Class Diagrams via Datalog+/-";
in: "Rule Technologies: Foundations, Tools, and Applications - 9th International Symposium, RuleML 2015", 9202; Springer LNCS, 2015, (invited), ISBN: 978-3-319-21541-9, 35 - 53.

UML class diagrams (UCDs) are a widely adopted formalism for modeling the intensional structure of a software system. Although UCDs are typically guiding the implementation of a system, it is common in practice that developers need to recover the class diagram from an implemented system. This process is known as reverse engineering. A fundamental property of reverse engineered (or simply re-engineered) UCDs is consistency, showing that the system is realizable in practice. In this work, we investigate the consistency of re-engineered UCDs, and we show is pspace-complete. The upper bound is obtained by exploiting algorithmic techniques developed for conjunctive query answering under guarded Datalog+/-, that is, a key member of the Datalog+/- family of KR languages, while the lower bound is obtained by simulating the behavior of a polynomial space Turing machine.

http://dx.doi.org/10.1007/978-3-319-21542-6_3

http://link.springer.com/content/pdf/10.1007%2F978-3-319-21542-6_3.pdf