TGV : a Tree Graph View for Modeling untypedXQueryNi
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منابع مشابه
Tree Graph Views: On Efficient Evaluation of XQuery in an XML Mediator
XQuery is the emerging standard for querying XML data sources. XLive is a light XML/XQuery mediator developed at University of Versailles whose engine processes an XML algebra derived from the relational one extended to process in dataflow XML trees. The query optimizer translates a subset of XQuery in this algebra. To extend the optimizer’s coverage of XQuery and better optimize query plans, w...
متن کاملTGV: A Tree Graph View for Modeling Untyped XQuery
XML [7] has become a de facto standard to exchange and represent any kind of data in various contexts. XML data can be manipulated using the XQuery [31] language, which can express though a compact and comprehensive way any queries and transformations. An XQuery expression is evaluated as follows. (1) the expression is rewritten into a "canonical XQuery", then (2) it is modeled in an internal r...
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Efficient evaluation of XML Query Languages has become a crucial issue for XML exchanges and integration. Tree Pattern (Sihem et al., 2002; Jagadish et al., 2001; Chen et al., 2003) are now well admitted for representing XML Queries and a model -called TGV (Travers, 2006; Travers et al., 2006; Travers et al., 2007c)has extended the Tree Pattern representation in order to make it more intuitive,...
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How to efficiently process queries in an heterogeneous and distributed data integration environment is an interesting and unsolved topic. Our research project proposes an approach for providing a generic cost framework for query optimization in an XML-based mediation system called XLive, which integrates heterogeneous data sources. Our approach relies on cost annotation on an XQuery logical rep...
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تاریخ انتشار 2006