This yearmarks anexciting time in the XML-database space:XQueryis moving closer to becoming a full W3C Recommendation, and the Big 3 database vendors (IBM, Oracle, Microsoft) are expected to release XQuery support in theirrelationalDBMSs,joininganumberofexistingopensourceandcommercial products. Thus, we are very pleased to feature an industrial paper (describing theXML-speci?cfeaturesofMicrosoftSQLServer)aswellas14researchpapers. XSym s focus this year was on building XML repositories, and papers discussed the following topics: indexing support for the evaluation of XPath and XQuery; benchmarks and algorithms for XQuery and XPath evaluation; algorithms for constraint satisfaction checking, information extraction, and subtree matching; and applications of XML in information systems. This year, XSym also coordinated its e?orts with the Database and P- gramming Languages Symposium, DBPL 2005. The resulting program included not only presentations of the papers in this proceedings, but also a joint DBPL- XSym keynote talk by Giuseppe Castagna, developer of the CDuce language for XML processing, and a joint panel on open XML research problems and challenges. The organizers would like to express their gratitude to the XSym Program Committee and external reviewers for their e?orts in providing very thorough evaluationsofthesubmittedpapersundersigni?canttimeconstraintsandto- crosoftfortheirsponsorshipandfortheuseoftheMicrosoftConferenceMana- ment Toolkit. We would also like to thank Gavin Bierman and Christoph Koch, the organizersof DBPL, for their e?orts andtheir willingness to coordinate with us. These proceedings are dedicated to Alberto Mendelzon who sadly passed awaythisyear.Asastrongsupporterofandactivecontributortothissymposium series he will always remain in our memory.

Includes supplementary material: sn.pub/extras

Autorentext
Günther Pernul hat an der Universität Wien Wirtschaftsinformatik und an der Technischen Universität Wien Informatik studiert. Der Abschluß des Studiengangs Wirtschaftsinformatik erfolgte im Jahre 1985. Von 1986 - 1989 war er wissenschaftlicher Mitarbeiter am Institut für Statistik und Informatik der Universität Wien. Im Jahr 1989 erfolgte seine Promotion zum Doktor der Sozial- und Wirtschaftswissenschaften. In den Jahren 1990 und 1991 war Günther Pernul Gastforscher am Database Systems Research and Development Center der University of Florida, Gainesville und am College of Computing des Georgia Institute of Technology in Atlanta. Von 1991-1995 war er Universitätsassistent am Institut für Angewandte Informatik und Informationssysteme der Universität Wien. Im Jahr 1993 erfolgte dort an der Fakultät für Sozial- und Wirtschaftswissenschaften seine Habilitation für Informatik. Von Oktober 1995 bis September 2002 war er C4-Professor an der Universität Duisburg-Essen. Seit Oktober 2002 hat er den Lehrstuhl für Wirtschaftsinformatik I an der Universität Regensburg inne.

Inhalt
Invited Talk (Shared with DBPL).- Patterns and Types for Querying XML Documents.- Constraints and Views.- Checking Functional Dependency Satisfaction in XML.- A Theoretic Framework for Answering XPath Queries Using Views.- Labeling and Path Evaluation.- A Path-Based Labeling Scheme for Efficient Structural Join.- The BIRD Numbering Scheme for XML and Tree Databases Deciding and Reconstructing Tree Relations Using Efficient Arithmetic Operations.- Efficient Handling of Positional Predicates Within XML Query Processing.- Indexing.- Relational Index Support for XPath Axes.- Supporting XPath Axes with Relational Databases Using a Proxy Index.- An Extended Preorder Index for Optimising XPath Expressions.- Benchmarking and Query Processing.- XPathMark: An XPath Benchmark for the XMark Generated Data.- MemBeR: A Micro-benchmark Repository for XQuery.- Main Memory Implementations for Binary Grouping.- Documents and Biometrical Applications.- Logic Wrappers and XSLT Transformations for Tuples Extraction from HTML.- Approximate Subtree Identification in Heterogeneous XML Documents Collections.- A Framework for XML-Based Integration of Data, Visualization and Analysis in a Biomedical Domain.- Industrial Session.- Optimizing Runtime XML Processing in Relational Databases.- Panel (Together with DBPL).- Panel: Whither XML, ca. 2005?.