403 search results - page 19 / 81 » Constraint Databases and Geographic Information Systems |
171
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PODS
2009
ACM
16 years 8 days ago
2009
ACM
The paper investigates the question of whether a partially closed database has complete information to answer a query. In practice an enterprise often maintains master data Dm, a ...
108
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DKE
2010
14 years 11 months ago
2010
We describe the Consistency Extractor System (ConsEx) that computes consistent answers to Datalog queries with negation posed to relational databases that may be inconsistent with...
106
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FOIKS
2004
Springer
15 years 3 months ago
2004
Springer
When two or more databases are combined into a global one, integrity may be violated even when each database is consistent with its own local integrity constraints. Efficient metho...
PRESENCE
1998
14 years 11 months ago
1998
The research we are reporting here is part of our effort to develop a navigation system for the blind. Our long-term goal is to create a portable, self-contained system that will ...
104
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CORR
2006
Springer
14 years 11 months ago
2006
Springer
Cultural heritage documentation induces the use of computerized techniques to manage and preserve the information produced. Geographical information systems have proved their pote...