342 search results - page 10 / 69 » Conjunctive Queries over Trees |
ICDM
2006
IEEE
14 years 1 months ago
2006
IEEE
New applications of data mining, such as in biology, bioinformatics, or sociology, are faced with large datasets structured as graphs. We present an efficient algorithm for minin...
DLOG
2011
12 years 11 months ago
2011
We show that, although conjunctive queries over OWL 2 QL ontologies are reducible to database queries, no algorithm can construct such a reduction in polynomial time without changi...
ICDE
2009
IEEE
14 years 9 months ago
2009
IEEE
We have developed a system to process database queries over composed data providing web services. The queries are transformed into execution plans containing an operator that invok...
VLDB
2003
ACM
14 years 8 months ago
2003
ACM
In data applications such as information integration, there can be limited access patterns to relations, i.e., binding patterns require values to be specified for certain attribut...
FQAS
2009
Springer
14 years 2 months ago
2009
Springer
Abstract. Controlled languages (CLs) are ambiguity-free subsets of natural languages such as English offering a good trade-off between the formal rigor of ontology and query langua...