Lock-based Protocols for Cooperation on XML Documents

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido

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URL: http://ub-madoc.bib.uni-mannheim.de/735
URN: urn:nbn:de:bsz:180-madoc-7359
Document Type: Working paper
Year of publication: 2003
The title of a journal, publication series: None
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik
MADOC publication series: Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject: 004 Computer science, internet
Subject headings (SWD): XML , Datenbank , Mehrfachzugriffsprotokoll
Keywords (English): databases , XML , synchronization
Abstract: The eXtensible Markup Language (XML) is well accepted in several different Web application areas. As soon as many users and applications work concurrently on the same collection of XML documents - e.g. on an XML database via a Web interface - isolating accesses and modifications of different transactions becomes an important issue. We discuss four different core protocols for synchronizing access to and modifications of XML document collections. These core protocols synchronize structure traversals and modifications. They are meant to be integrated into a native XML base management System (XBMS) and are based on two phase locking. We also demonstrate the different degrees of cooperation that are possible with these protocols by various experimental results. Furthermore, we also discuss extensions of these core protocols to full-fledged protocols. Further, we show how to achieve a higher degree of concurrency by exploiting the semantics expressed in Document Type Definitions (DTDs).
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