9 search results - page 2 / 2 » Taming the Infinite Chase: Query Answering under Expressive ... |
CCS
2007
ACM
13 years 11 months ago
2007
ACM
In this paper, we study the maintenance of role-based access control (RBAC) models in database environments using transitive closure relations. In particular, the algorithms that ...
IDEAS
2003
IEEE
13 years 10 months ago
2003
IEEE
The objective of this paper is to investigate the problems related to the extensional integration of information sources. In particular, we propose an approach for managing incons...
PODS
2008
ACM
14 years 5 months ago
2008
ACM
In the study of data exchange one usually assumes an openworld semantics, making it possible to extend instances of target schemas. An alternative closed-world semantics only move...
SIGMOD
2007
ACM
14 years 5 months ago
2007
ACM
Translating data and data access operations between applications and databases is a longstanding data management problem. We present a novel approach to this problem, in which the...