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DEA SIR (in French) University of Paris VI, Paris, France. OZSU, T. AND VALDURIEZ, P. 1999. ). PrenticeHall, Englewood Cliffs, NJ. SEGOUFIN, L. 2003. Personal communication. , AND LI, Q. 1997. Algorithms for materialized view design in data warehousing environment. In VLDB ’97: Proceedings of the 23rd International Conference on Very Large Data Bases. Morgan Kaufman Publishers, San Francisco, CA, 136–145. , AND WIDOM, J. 1995. View maintenance in a warehousing environment. In Proceedings of ACM SIGMOD.

While the static structure of such documents can be described by some DTD or XML Schema, our extension of XML Schema with function types is a first step toward a more precise description of XML documents embedding computation. Further work in that direction is clearly needed to better understand this powerful paradigm. There are a number of other proposals for typing XML documents, for example, Makoto [2001], Hosoya and Pierce [2000], and Cluet et al. [1998]. We selected XML Schema (see footnote 10) for several reasons.

Obviously all points in the skyline of s3 must appear in the final skyline, while those in s2 ACM Transactions on Database Systems, Vol. 30, No. 1, March 2005. Progressive Skyline Computation in Database Systems • 45 are discarded immediately because they are dominated by any point in s3 (in fact s2 needs to be considered only if s3 is empty). Each skyline point in s1 is compared only with points in s3 , because no point in s2 or s4 can dominate those in s1 . In this example, points c, g are removed because they are dominated by i.

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ACM Transactions on Database Systems (March) by Gio (Editor) Wiederhold


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