Browsing by Author "Henriques, R."
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- Description logics, rules and multi‐context systemsPublication . L. Cruz‐Filipe, l.; Henriques, R.; Nunes, I.The combination of rules and ontologies has been a fertile topic of research in the last years, with the proposal of several different systems that achieve this goal. In this paper, we look at two of these formalisms, Mdl-programs and multi-context systems, which address different aspects of this combination, and include different, incomparable programming constructs. Despite this, we show that every Mdl-program can be transformed in a multi-context system, and this transformation relates the different semantics for each paradigm in a natural way. As an application, we show how a set of design patterns for multi-context systems can be obtained from previous work on Mdl-programs.
- Tighter integration in dl-programsPublication . Cruz-Filipe, L.; Engrácia, P.; Gaspar, G.; Henriques, R.; Nunes, I.; Santos, D.We introduce a mechanism called lifting to share predicates between the two components of a dl-program, integrating them in a tighter way. Using lifting, one can reason about the predicates being shared both via the description logic knowledge base and via Datalogstyle rules, and the deductions one makes are automatically reflected globally on both components. This is a capability not directly present in dl-programs, since changes to the knowledge base only affect the queries where they occur. We show that lifting has nice theoretical properties, making it suitable for modular design of dl-programs. Furthermore, dlprogram processors can easily incorporate lifting as a new operator, and we have extended dlvhex to work with dl-programs with lifting.