103 search results - page 15 / 21 » Views and queries: determinacy and rewriting |
EDBT
2008
ACM
14 years 9 months ago
2008
ACM
We address the problem of generating a mediated schema from a set of relational data source schemas and conjunctive queries that specify where those schemas overlap. Unlike past a...
ICDE
2006
IEEE
14 years 11 months ago
2006
IEEE
We present ACXESS (Access Control for XML with Enhanced Security Specifications), a system for specifying and enforcing enhanced security constraints on XML via virtual "secu...
VLDB
2007
ACM
14 years 10 months ago
2007
ACM
The database community is on a constant quest for better integration of data management and knowledge management. Recently, with the increasing use of ontology in various applicat...
CORR
2011
Springer
13 years 4 months ago
2011
Springer
Contemporary use of the term ’intension’ derives from the traditional logical doctrine that an idea has both an extension and an intension. In this paper we introduce an intens...
SIGMOD
2006
ACM
14 years 10 months ago
2006
ACM
Integration systems typically support only a restricted set of queries over the schema they export. The reason is that the participating information sources contribute limited con...