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| Content Provider | ACM Digital Library |
|---|---|
| Author | Nguyen, Philip H. P. Kaneiwa, Ken |
| Abstract | In the Semantic Web context, the meta-modeling of concepts in ontologies and rules is required for defining the meanings of upper-level data and vocabularies. For this purpose, we propose a decidable fragment of order-sorted logic programming with hyper-predicate hierarchies. In the sorted language, we can employ simple- and hyper-predicates to express the concepts of sorts, predicates, and meta-predicates by unifying and enhancing them in a hyper-predicate hierarchy. The sorted Horn-clause calculus is extended to develop a query-answering system that can answer queries such as atoms and hyper-atoms generalized to contain predicate variables. We show that each query is computable in NEXPTIME if knowledge bases are function-free and safe. Furthermore, the computation can be reduced to EXPTIME if additional arguments in super-predicates and multiple predicate declarations are restricted. |
| Starting Page | 312 |
| Ending Page | 319 |
| Page Count | 8 |
| File Format | |
| ISBN | 9781450308571 |
| DOI | 10.1145/2245276.2245339 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2012-03-26 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Content Type | Text |
| Resource Type | Article |
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