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XQuery from the Experts: A Guide to the W3C XML Query Language by Philip Wadler, Jim Tivy, Jérôme Siméon, Michael Rys, Jonathan Robie, Michael Kay, Mary Fernández, Denise Draper, Don Chamberlin, Howard Katz - Editor

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Composition Techniques: Common Concepts

Every composed representation requires some ability to express how an XML document is composed from the rows and columns of an SQL database. Over the last several years, many different approaches have been tried, some as research projects, some commercially. These techniques may look very different, but they have a number of conceptual similarities, which we will examine. In the next section we look at some specific techniques that use these concepts. As usual, we do not attempt to list the different composition techniques currently in use by vendors, concentrating instead on the underlying principles and variations.

Certain concepts are common to most composition techniques. First of all, a composition ...

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