427 search results - page 12 / 86 » Conjunctive Query Answering in EL using a Database System |
SIGMOD
2005
ACM
14 years 9 months ago
2005
ACM
Although integrity constraints have long been used to maintain data consistency, there are situations in which they may not be enforced or satisfied. In this paper, we present Con...
DEXAW
2007
IEEE
14 years 3 months ago
2007
IEEE
This paper presents an information retrieval methodology which uses Formal Concept Analysis in conjunction with semantics to provide contextual answers to users’ queries. User f...
DLOG
2011
13 years 8 days ago
2011
W3C currently extends the SPARQL query language with so-called entailment regimes, which define how queries are evaluated using logical entailment relations. We describe a sound a...
EDBT
2006
ACM
14 years 8 months ago
2006
ACM
Current methods for selectivity estimation fall into two broad categories, synopsis-based and sampling-based. Synopsis-based methods, such as histograms, incur minimal overhead at ...
EDBTW
2006
Springer
14 years 13 days ago
2006
Springer
For several reasons a database may not satisfy a given set of integrity constraints (ICs), but most likely most of the information in it is still consistent with those ICs; and cou...