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

By Gio (Editor) Wiederhold

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Extra resources for ACM Transactions on Database Systems (March)

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5. Recursion tree. space. Lets call such a query empty, to distinguish it from nonempty queries that return results, each spawning d new recursive applications of the algorithm (where d is the dimensionality of the data space). Figure 5 shows a query processing tree, where empty queries are illustrated as transparent cycles. For the second level of recursion, for instance, the second query does not return any results, in which case the recursion will not proceed further. Some of the nonempty queries may be redundant, meaning that they return skyline points already found by previous queries.

16. Peer-to-peer news exchange. All interactions between news sources, aggregators, and clients are done through calls to Web services they provide. Intensional documents can be exchanged both when passing parameters to these Web services, and in the answers they return. These exchanges are controlled by XML schemas, and documents are rewritten to match these schemas, using the safe/possible rewriting algorithms detailed in the previous sections. This mechanism is used to provide several versions of a service, without changing its implementation, merely by using different schemas for its input parameters and results.

We had the choice between extending an existing XML Schema parser based on DOM level 3 or developing an implementation from scratch [Ngoc 2002]. Whereas the first solution seems preferable, we followed the second one because, at the time we started the implementation, the available (free) software we tried (Apache Xerces16 and Oracle Schema Processor17 ) appeared to have limited extensibility. 16 It does not cover all the features of XML Schema, but implements the important ones such as complex types, element/type references, and schema import.

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