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Auflistung nach Schlagwort "Xpath"

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  • Konferenzbeitrag
    Catalog integration made easy
    (BTW 2003 – Datenbanksysteme für Business, Technologie und Web, Tagungsband der 10. BTW Konferenz, 2003) Marrón, Pedro José; Lausen, Georg; Weber, Martin
    In this paper, we study adaptive evaluation techniques for querying XML-based electronic catalogs, and show, by means of experiments performed on real-world catalogs, that our approach can be used to integrate them with virtually zero effort at start-up time, and a small constant factor needed to perform the adaptive evaluation for all subsequent queries. We reach the conclusion that, from a strictly technical perspective, the classic role of the global catalog can be assumed in an ad-hoc manner by any catalog that forms part of a collaborative federation of XML-based catalogs, and implements our adaptive query algorithms, independently of the storage model used to access its contents.
  • Konferenzbeitrag
    Transaction validation for XML documents based on XPath
    (Informatik bewegt: Informatik 2002 - 32. Jahrestagung der Gesellschaft für Informatik e.v. (GI), 2002) Böttcher, Stefan; Türling, Adelhard
    Whenever mobile devices modify copies of common XML data, then synchronization of multiple user transactions accessing this data is a key problem. However compared to standard XML database systems, transaction synchronization has to solve new problems, i.e. it has to manage lost connections and it furthermore should reduce data exchange over small bandwidth client connections for the purpose of synchronization. In order to avoid locks that are assigned to transactions of "lost" clients, we suggest to use an optimistic approach to synchronization. In order to reduce the data exchange for synchronization, we furthermore suggest to exchange XPath expressions instead of larger XML fragments wherever possible. This allows us not only to treat lost connections more flexible but also to operate efficiently on mobile devices with small bandwidth connections to a server.