274 search results - page 26 / 55 » Computational complexity of queries based on itemsets |
CSFW
2008
IEEE
15 years 7 months ago
2008
IEEE
DKAL is a new declarative authorization language for distributed systems. It is based on existential fixed-point logic and is considerably more expressive than existing authoriza...
178
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VLDB
2002
ACM
16 years 21 days ago
2002
ACM
We propose a new data structure to search in metric spaces. A metric space is formed by a collection of objects and a distance function de ned among them, which satis es the trian...
CIKM
1999
Springer
15 years 4 months ago
1999
Springer
On-line analytical processing (OLAP) requires e cient processing of complex decision support queries over very large databases. It is well accepted that pre-computed data cubes ca...
125
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DEXA
2005
Springer
15 years 6 months ago
2005
Springer
In this paper we introduce a novel architecture for data processing, based on a functional fusion between a data and a computation layer. We show how such an architecture can be le...
127
Voted
JACM
2008
15 years 14 days ago
2008
XML queries are usually expressed by means of XPath expressions identifying portions of the selected documents. An XPath expression defines a way of navigating an XML tree and ret...