789 search results - page 42 / 158 » On Theory Revision with Queries |
WWW
2008
ACM
16 years 15 days ago
2008
ACM
Local aspects of Web search -- associating Web content and queries with geography -- is a topic of growing interest. However, the underlying question of how spatial variation is m...
189
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PODS
2009
ACM
16 years 11 days ago
2009
ACM
We consider the problem of deciding query equivalence for a conjunctive language in which queries output complex objects composed from a mixture of nested, unordered collection ty...
SIGIR
2006
ACM
15 years 5 months ago
2006
ACM
Combining the output from multiple retrieval sources over the same document collection is of great importance to a number of retrieval tasks such as multimedia retrieval, web retr...
ICDT
2005
ACM
15 years 5 months ago
2005
ACM
The existence of a language expressing precisely the PTIME queries on arbitrary structures remains the central open problem in the theory of database query languages. As it turns o...
118
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ICDT
2010
ACM
15 years 1 months ago
2010
ACM
When a query is evaluated under bag semantics, each answer is returned as many times as it has derivations. Bag semantics has long been recognized as important, especially when ag...