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The remaining space is split in two partitions based on the coordinates (ix , i y ) of point i: (i) [0, ix ) [0, ∞) and (ii) [0, ∞) [0, i y ). In Figure 3(a), the first partition contains subdivisions 1 and 3, while the second one contains subdivisions 1 and 2. The partitions resulting after the discovery of a skyline point are inserted in a to-do list. While the to-do list is not empty, NN removes one of the partitions 3 NN (and BBS) can be applied with any monotone function; the skyline points are the same, but the order in which they are discovered may be different.
1, March 2005. 36 • T. Milo et al. A more complex scenario allows readers to specify a desired output type at call time, as a parameter of the service call. If there exists a rewriting of the output that matches this schema, it will be applied before sending the result, otherwise an error message will be returned. Aggregators act as “superpeers” in the network. They know a number of news sources they can use to answer user queries. They also know other aggregators, which can relay the queries to additional news sources and other aggregators, transitively.
Also the space consumption may be prohibitive, if the number of distinct values is large. Finally, the technique is not suitable for dynamic datasets where insertions may alter the rankings of attribute values. 4 Index The index approach organizes a set of d -dimensional points into d lists such that a point p = ( p1 , p2 , . . , pd ) is assigned to the ith list (1 ≤ i ≤ d ), if and only if its coordinate pi on the ith axis is the minimum among all dimensions, or formally, pi ≤ p j for all j = i.