Combining Nonmonotonic Knowledge Bases with External Sources

摘要: The developments in information technology during the last decade have been rapidly changing possibilities for data and knowledge access. To respect this, several declarative representation formalisms extended with capability to access sources that are external a base. This article reviews some of these centered around Answer Set Programming, viz. HEX-programs, modular logic programs, multi-context systems, which were developed by KBS group Vienna University Technology cooperation colleagues. These designed different principles four settings, thus properties features; however, as argued, they not unrelated. Furthermore, provide basis advanced knowledge-based targeted ongoing research projects.