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» On the Expressive Power of the Loop Language
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VLDB
1995
ACM
103views Database» more  VLDB 1995»
15 years 5 months ago
Querying Shapes of Histories
We present a shape definition language, called SDC, for retrieving objects based on shapes contained in the histories associated with these objects. It is a small, yet powerful, l...
Rakesh Agrawal, Giuseppe Psaila, Edward L. Wimmers...
ESOP
2010
Springer
15 years 5 months ago
A Semantic Framework for Declassification and Endorsement
Language-based information flow methods offer a principled way to enforce strong security properties, but enforcing noninterference is too inflexible for realistic applications. Se...
Aslan Askarov, Andrew Myers
KRDB
2003
137views Database» more  KRDB 2003»
15 years 3 months ago
Focused Search on the Web using WeQueL
Keyword-based web query languages suffer from a lack of precision when searching for a precise kind of documents. Indeed, some documents cannot be simply characterized by a list o...
Amar-Djalil Mezaour
VLDB
1987
ACM
108views Database» more  VLDB 1987»
15 years 5 months ago
Translating and Optimizing SQL Queries Having Aggregates
is at least ae powerful as SQL. Two well known relational query languages that have a sound theoretical foundation are relational algebra and relational calculus. As SQL is more cl...
Günter von Bültzingsloewen
PVLDB
2010
151views more  PVLDB 2010»
15 years 11 days ago
Advanced Processing for Ontological Queries
Ontology-based data access is a powerful form of extending database technology, where a classical extensional database (EDB) is enhanced by an ontology that generates new intensio...
Andrea Calì, Georg Gottlob, Andreas Pieris