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This paper addresses the efficient processing of queries involving aggregation and group-by in the semantic-model approach to information integration. Query processing algorithms materialization, subqueries, and wrapper have been extended for such aggregate queries. Algorithms have been presented for two cases: In the first case information at different sources are disjoint, while in the second case...
An Active XML(AXML for short) is an XML document where some of the data is given explicitly while other parts are defined only intentionally by means of embedded calls to Web services. Introducing intentional data, it brings many new problems to XML documents. The problems of document and schema rewriting are fundamental in practice. In this paper, we try to to solve AXML rewriting problems by using...
As XML has become a standard for data representation, it is inevitable to propose and implement techniques for efficient managing of XML data. A natural alternative is to exploit features and functions of (O)RDBMSs, i.e. to rely on their long theoretical and practical history. The main concern of such techniques is the choice of an appropriate XML-to-relational mapping strategy. In this paper we propose...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.