72 research outputs found

    Web information management with access control

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    International audienceWe investigate the problem of sharing private information on the Web, where the information is hosted on diïŹ€erent machines that may use diïŹ€erent access control and distribution schemes. We introduce a distributed knowledge-base model, termed WebdamExchange, that comprises logical statements for specifying data, access control, distribution and knowledge about other peers. The statements can be communicated, replicated, queried, and updated, while keeping track of time and provenance. This uniïŹed base allows applications to reason declaratively about what data is accessible, where it resides, and how to retrieve it securely

    The AXML Artifact Model

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    International audienceTowards a data-centric workflow approach, we introduce an artifact model to capture data and workflow management activities in distributed settings. The model is built on Active XML, i.e., XML trees including Web service calls. We argue that the model captures the essential features of business artifacts as described informally in [1] or discussed in [2]. To illustrate, we briefly consider the monitoring of distributed systems and the verification of temporal properties for them

    Gestion de DonnĂ©es DistribuĂ©es avec ContrĂŽle d’AccĂšs : rĂ©seaux sociaux et donnĂ©es du Web

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    The amount of information on the Web is spreading very rapidly. Users as well as companies bring data to the network and are willing to share with others. They quickly reach a situation where their information is hosted on many machines they own and on a large number of autonomous systems where they have accounts. Management of all this information is rapidly becoming beyond human expertise. We introduce WebdamExchange, a novel distributed knowledge-base model that includes logical statements for specifying information, access control, secrets, distribution, and knowledge about other peers. These statements can be communicated, replicated, queried, and updated, while keeping track of time and provenance. The resulting knowledge guides distributed data management. WebdamExchange model is based on WebdamLog, a new rule-based language for distributed data management that combines in a formal setting deductiverules as in Datalog with negation, (to specify intensional data) and active rules as in Datalog:: (for updates and communications). The model provides a novel setting with a strong emphasis on dynamicity and interactions(in a Web 2.0 style). Because the model is powerful, it provides a clean basis for the specification of complex distributed applications. Because it is simple, it provides a formal framework for studying many facets of the problem such as distribution, concurrency, and expressivity in the context of distributed autonomous peers. We also discuss an implementation of a proof-of-concept system that handles all the components of the knowledge base and experiments with a lighter system designed for smartphones. We believe that these contributions are a good foundation to overcome theproblems of Web data management, in particular with respect to access control.La masse d’information disponible sur leWeb s’accroit rapidement, sous l’afflux de donnĂ©es en provenance des utilisateurs et des compagnies. Ces donnĂ©es qu’ils souhaitent partager de façon controllĂ©e sur le rĂ©seau et quisont rĂ©parties sur de nombreuses machines et systĂšmes diffĂ©rents, ne sont rapidement plus gĂ©rables directement par des moyens humains. Nous introduisons WebdamExchange, un nouveau modĂšle de bases de connaissancesdistribuĂ©es, qui comprend des assertions au sujet des donnĂ©es, du contrĂŽle d’accĂ©s et de la distribution. Ces assertions peuvent ĂȘtre Ă©changĂ©es avec d’autres pairs, rĂ©pliquĂ©es, interrogĂ©es et mises Ă  jour, en gardant la trace de leur origine. La base de connaissance permet aussi de guider de façon automatique sa propre gestion. WebdamExchange est basĂ© surWebdamLog, un nouveau langage de rĂšgles pour la gestion de donnĂ©es distribuĂ©es, qui associe formellement les rĂšgles dĂ©ductives de Datalog avec nĂ©gation et les rĂšgles actives de Datalog::. WebdamLog met l’accent sur la dynamicitĂ© et les interactions, caractĂ©ristiques du Web 2.0. Ce modĂšle procure Ă  la fois un langage expressif pour la spĂ©cification de systĂšmes distribuĂ©s complexes et un cadre formel pour l’étude de propriĂ©tĂ©s fondamentales de la distribution. Nous prĂ©sentons aussi une implĂ©mentation de notre base de connaissance. Nous pensons que ces contributions formentune fondation solide pour surmonter les problĂšmes de gestion de donnĂ©es du Web, en particulier dans le cadre du contrĂŽle d’accĂšs

    Gestion de Données Distribuées avec ContrÎle d AccÚs (réseaux sociaux et données du Web)

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    La masse d information disponible sur leWeb s accroit rapidement, sous l afflux de donnĂ©es en provenance des utilisateurs et des compagnies. Ces donnĂ©es qu ils souhaitent partager de façon controllĂ©e sur le rĂ©seau et quisont rĂ©parties sur de nombreuses machines et systĂšmes diffĂ©rents, ne sont rapidement plus gĂ©rables directement par des moyens humains. Nous introduisons WebdamExchange, un nouveau modĂšle de bases de connaissancesdistribuĂ©es, qui comprend des assertions au sujet des donnĂ©es, du contrĂŽle d accĂ©s et de la distribution. Ces assertions peuvent ĂȘtre Ă©changĂ©es avec d autres pairs, rĂ©pliquĂ©es, interrogĂ©es et mises Ă  jour, en gardant la trace de leur origine. La base de connaissance permet aussi de guider de façon automatique sa propre gestion. WebdamExchange est basĂ© surWebdamLog, un nouveau langage de rĂšgles pour la gestion de donnĂ©es distribuĂ©es, qui associe formellement les rĂšgles dĂ©ductives de Datalog avec nĂ©gation et les rĂšgles actives de Datalog::. WebdamLog met l accent sur la dynamicitĂ© et les interactions, caractĂ©ristiques du Web 2.0. Ce modĂšle procure Ă  la fois un langage expressif pour la spĂ©cification de systĂšmes distribuĂ©s complexes et un cadre formel pour l Ă©tude de propriĂ©tĂ©s fondamentales de la distribution. Nous prĂ©sentons aussi une implĂ©mentation de notre base de connaissance. Nous pensons que ces contributions formentune fondation solide pour surmonter les problĂšmes de gestion de donnĂ©es du Web, en particulier dans le cadre du contrĂŽle d accĂšs.The amount of information on the Web is spreading very rapidly. Users as well as companies bring data to the network and are willing to share with others. They quickly reach a situation where their information is hosted on many machines they own and on a large number of autonomous systems where they have accounts. Management of all this information is rapidly becoming beyond human expertise. We introduce WebdamExchange, a novel distributed knowledge-base model that includes logical statements for specifying information, access control, secrets, distribution, and knowledge about other peers. These statements can be communicated, replicated, queried, and updated, while keeping track of time and provenance. The resulting knowledge guides distributed data management. WebdamExchange model is based on WebdamLog, a new rule-based language for distributed data management that combines in a formal setting deductiverules as in Datalog with negation, (to specify intensional data) and active rules as in Datalog:: (for updates and communications). The model provides a novel setting with a strong emphasis on dynamicity and interactions(in a Web 2.0 style). Because the model is powerful, it provides a clean basis for the specification of complex distributed applications. Because it is simple, it provides a formal framework for studying many facets of the problem such as distribution, concurrency, and expressivity in the context of distributed autonomous peers. We also discuss an implementation of a proof-of-concept system that handles all the components of the knowledge base and experiments with a lighter system designed for smartphones. We believe that these contributions are a good foundation to overcome theproblems of Web data management, in particular with respect to access control.PARIS11-SCD-Bib. Ă©lectronique (914719901) / SudocSudocFranceF
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