443 search results - page 76 / 89 » Quasi-inverses of schema mappings |
DOLAP
2006
ACM
14 years 1 months ago
2006
ACM
One of the most important tasks performed in the early stages of a data warehouse project is the analysis of the structure and content of the existing data sources and their inten...
SACMAT
2006
ACM
14 years 1 months ago
2006
ACM
In this paper we propose an access control model for the Resource Description Framework (RDF). We argue that existing access control models, like the ones developed for securing e...
ER
2004
Springer
14 years 27 days ago
2004
Springer
Updates over virtual XML views that wrap the relational data have not been well supported by current XML data management systems. This paper studies the problem of the existence of...
VLDB
2004
ACM
14 years 26 days ago
2004
ACM
We consider the problem of data sharing between autonomous data sources in an environment where constraints cannot be placed on the shared contents of sources. Our solutions rely ...
RULES
1993
Springer
13 years 11 months ago
1993
Springer
Semantic models have shown the utility of arbitrary user-de ned relationships for de ning the semantics of database information, while objectoriented models have developed a stron...