131 search results - page 11 / 27 » Linear Constraint Query Languages: Expressive Power and Comp... |
DBPL
2001
Springer
14 years 4 days ago
2001
Springer
Abstract. We are interested in the theoretical foundations of the optimization of conjunctive regular path queries (CRPQs). The basic problem here is deciding query containment bot...
ICLP
1997
Springer
13 years 11 months ago
1997
Springer
Kowalski and Sergot’s Event Calculus (EC) is a simple temporal formalism that, given a set of event occurrences, derives the maximal validity intervals (MVIs) over which propert...
VLDB
1991
ACM
13 years 11 months ago
1991
ACM
A model capturing the data manipulation capabilities of a large class of methods in ohjectoriented databases is proposed and investsigated. The model uses a deterministic, paralle...
SIGMOD
1996
ACM
13 years 11 months ago
1996
ACM
While much recent research has focussed on extending databases beyond the traditional relational model, relatively little has been done to develop database tools for querying data...
SIGMOD
2007
ACM
14 years 7 months ago
2007
ACM
XML is the data interoperability standard in many application domains. Therefore, an increasing number of researchers and professionals, who are not computer scientists (although ...