383 search results - page 15 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
194
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ICDE
2006
IEEE
16 years 1 months ago
2006
IEEE
Relational division, also known as small divide, is a derived operator of the relational algebra that realizes a many-to-one set containment test, where a set is represented as a ...
PVLDB
2010
14 years 10 months ago
2010
ICFCA
2007
Springer
15 years 5 months ago
2007
Springer
We model a Digital Library as a formal context in which objects are documents and attributes are terms describing documents contents. A formal concept is very close to the notion o...
105
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SEBD
2007
15 years 1 months ago
2007
The use of ontologies in various application domains, such as Data Integration, the Semantic Web, or ontology-based data management, where ontologies provide the access to large am...
110
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BNCOD
2009
15 years 24 days ago
2009
We study the expressiveness of a positive fragment of path queries, denoted Path+ , on node-labeled trees documents. The expressiveness of Path+ is studied from two angles. First, ...