43 search results - page 4 / 9 » Inverse Roles Make Conjunctive Queries Hard |
CIKM
2011
Springer
12 years 9 months ago
2011
Springer
We present Nyaya, a system for the management of Semantic-Web data which couples a general-purpose and extensible storage mechanism with efficient ontology reasoning and querying ...
ICDT
2010
ACM
14 years 7 months ago
2010
ACM
The work reported here lays the foundations of data exchange in the presence of probabilistic data. This requires rethinking the very basic concepts of traditional data exchange, ...
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GIS
2006
ACM
14 years 10 months ago
2006
ACM
Remotely sensed data, in particular satellite imagery, play many important roles in environmental applications and models. In particular applications that study (rapid) changes in...
SIGMOD
2009
ACM
14 years 2 months ago
2009
ACM
It has recently been asserted that the usability of a database is as important as its capability. Understanding the database schema, the hidden relationships among attributes in t...
PODS
2007
ACM
14 years 10 months ago
2007
ACM
The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergr...