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ICDT
2007
ACM
126views Database» more  ICDT 2007»
15 years 8 months ago
Containment of Conjunctive Queries over Databases with Null Values
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
Carles Farré, Werner Nutt, Ernest Teniente,...
VLDB
2007
ACM
126views Database» more  VLDB 2007»
16 years 2 months ago
Querying Complex Structured Databases
Correctly generating a structured query (e.g., an XQuery or a SQL query) requires the user to have a full understanding of the database schema, which can be a daunting task. Alter...
Cong Yu, H. V. Jagadish
PODS
2001
ACM
145views Database» more  PODS 2001»
16 years 2 months ago
Optimization of Sequence Queries in Database Systems
The need to search for complex and recurring patterns in database sequences is shared by many applications. In this paper, we discuss how to express and support efficiently sophis...
Reza Sadri, Carlo Zaniolo, Amir M. Zarkesh, Jafar ...
LREC
2010
211views Education» more  LREC 2010»
15 years 3 months ago
EcoLexicon: An Environmental TKB
EcoLexicon, a multilingual knowledge resource on the environment, provides an internally coherent information system covering a wide range of specialized linguistic and conceptual...
Arianne Reimerink, Pilar León Araúz,...
CORR
2000
Springer
104views Education» more  CORR 2000»
15 years 2 months ago
ATLAS: A flexible and extensible architecture for linguistic annotation
We describe a formal model for annotating linguistic artifacts, from which we derive an application programming interface (API) to a tools for manipulating these annotations. The ...
Steven Bird, David Day, John S. Garofolo, John Hen...