98 search results - page 13 / 20 » Repairing Queries in a Mediator Approach |
JODL
2000
13 years 7 months ago
2000
In this paper we present a new approach for building metadata schemas by integrating existing ontologies and structured vocabularies (thesauri). This integration is based on the s...
AIMSA
2010
Springer
13 years 9 months ago
2010
Springer
Abstract. Ontology based data access (OBDA) is concerned with providing access to typically very large data sources through a mediating conceptual layer that allows one to improve ...
ICDE
2007
IEEE
14 years 9 months ago
2007
IEEE
Incompleteness due to missing attribute values (aka "null values") is very common in autonomous web databases, on which user accesses are usually supported through media...
SIGMOD
2011
ACM
12 years 10 months ago
2011
ACM
The emergence of Web 2.0 has resulted in a huge amount of heterogeneous data that are contributed by a large number of users, engendering new challenges for data management and qu...
COOPIS
1997
IEEE
14 years 3 days ago
1997
IEEE
To simplify the task of obtaining information from the vast number of information sources that are available on the World Wide Web (WWW), we are building tools to build informatio...