# On the Maintenance of XML Materialized Views

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1 PRISM - Parallélisme, Réseaux, Systèmes, Modélisation 2 ETIS - Equipes Traitement de l-Information et Systèmes

Abstract : Providing services by integrating information available in web resources is one of the main goals of a mediation architecture. In this paper, we consider the standard wrapper-mediator architecture under the following hypothesis: $i$ the information exchanged between wrappers and the mediator consists in XML documents, $ii$ wrappers have limited resources, and $iii$ to answer queries even if sources are not available, materialized XML views are stored at the mediator level. In this setting, we focus on the problem of maintaining materialized XML views, when the sources change. In our context, wrappers send the updated document without providing any information about the type and the localization of the update in the document. Then, the problems we address are, first, identifying the updates, and, second, updating the view in such a way that accesses to the sources are restricted. Our approach is based on the XAlgebra, which allows to consider XQuery requests on XML documents as relational tables. Moreover, our solution uses identifier annotations for XAlgebra and a {\it diff} function.

Autor: Tuyet-Tram Dang-Ngoc - Dominique Laurent - Virginie Sans -

Fuente: https://hal.archives-ouvertes.fr/

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