95 search results - page 8 / 19 » The Complexity of Conjunctive Query Answering in Expressive ... |
PODS
2006
ACM
14 years 7 months ago
2006
ACM
Privacy-preserving query-answering systems answer queries while provably guaranteeing that sensitive information is kept secret. One very attractive notion of privacy is perfect p...
KR
2004
Springer
14 years 1 months ago
2004
Springer
The main contribution of this paper is the definition of the preference description language ¡¢ . This language allows us to combine qualitative and quantitative, penalty bas...
SEMWEB
2007
Springer
14 years 1 months ago
2007
Springer
Abstract. An important open question in the semantic Web is the precise relationship between the RDF(S) semantics and the semantics of standard knowledge representation formalisms ...
SSDBM
2002
IEEE
14 years 16 days ago
2002
IEEE
This paper presents an approach to answering queries over an ontology modelled using a description logic. The ontology acts as a global schema, providing a declarative description...
KR
2010
Springer
14 years 13 days ago
2010
Springer
Ontologies can be used to provide an enriched vocabulary for the formulation of queries over instance data. We identify query emptiness and predicate emptiness as two central reas...