Efficient Querying of XML Data Through Arbitrary Security Views
Identifieur interne : 000237 ( Main/Exploration ); précédent : 000236; suivant : 000238Efficient Querying of XML Data Through Arbitrary Security Views
Auteurs : Houari Mahfoud [Algérie] ; Abdessamad Imine [France]Source :
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Abstract
We study the problem of querying virtual security views of XML data that has received a great attention during the past years. A major concern here is that user XPath queries posed on recursive views cannot be rewritten to be evaluated on the underlying XML data. Existing rewriting solutions are based on the non-standard language, “Regular XPath”, which makes rewriting possible under recursion. However, query rewriting under Regular XPath can be of exponential size. We show that query rewriting is always possible for arbitrary security views (recursive or not) by using only the expressive power of the standard XPath. We propose a more expressive language to specify XML access control policies as well as an efficient algorithm to enforce such policies. Finally, we present our system, called SVMAX, that implements our solutions and we show that it scales well through an extensive experimental study based on real-life DTD.
Url:
DOI: 10.1007/978-3-662-48567-5_3
Affiliations:
- Algérie, France
- Franche-Comté, Grand Est, Lorraine (région)
- Belfort, Besançon, Nancy
- Institut national polytechnique de Lorraine, Université Nancy 2, Université de Bourgogne Franche-Comté, Université de Franche-Comté, Université de Lorraine, Université de technologie de Belfort-Montbéliard
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A major concern here is that user XPath queries posed on recursive views cannot be rewritten to be evaluated on the underlying XML data. Existing rewriting solutions are based on the non-standard language, “Regular XPath”, which makes rewriting possible under recursion. However, query rewriting under Regular XPath can be of exponential size. We show that query rewriting is always possible for arbitrary security views (recursive or not) by using only the expressive power of the standard XPath. We propose a more expressive language to specify XML access control policies as well as an efficient algorithm to enforce such policies. Finally, we present our system, called SVMAX, that implements our solutions and we show that it scales well through an extensive experimental study based on real-life DTD.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Franche-Comté</li><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Belfort</li><li>Besançon</li><li>Nancy</li></settlement><orgName><li>Institut national polytechnique de Lorraine</li><li>Université Nancy 2</li><li>Université de Bourgogne Franche-Comté</li><li>Université de Franche-Comté</li><li>Université de Lorraine</li><li>Université de technologie de Belfort-Montbéliard</li></orgName></list><tree><country name="Algérie"><noRegion><name sortKey="Mahfoud, Houari" sort="Mahfoud, Houari" uniqKey="Mahfoud H" first="Houari" last="Mahfoud">Houari Mahfoud</name></noRegion></country><country name="France"><region name="Grand Est"><name sortKey="Imine, Abdessamad" sort="Imine, Abdessamad" uniqKey="Imine A" first="Abdessamad" last="Imine">Abdessamad Imine</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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