Keynote Speech.- Building an Extensible XQuery Engine: Experiences with Galax (Extended Abstract).- XQuery Processing.- A Light but Formal Introduction to XQuery.- XML Query Processing Using a Schema-Based Numbering Scheme.- Implementing Memoization in a Streaming XQuery Processor.- Searching, Ranking, and Mapping XML Documents.- XQuery Processing with Relevance Ranking.- Information Preservation in XML-to-Relational Mappings.- A Signature-Based Approach for Efficient Relationship Search on XML Data Collections.- XML Constraints Checking and Correcting.- Correctors for XML Data.- Incremental Constraint Checking for XML Documents.- EReX: A Conceptual Model for XML.- XML Processing.- A Runtime System for XML Transformations in Java.- Teaching Relational Optimizers About XML Processing.- Adjustable Transaction Isolation in XML Database Management Systems.- Clustering, Indexing, Statistics.- Fractional XSketch Synopses for XML Databases.- Flexible Workload-Aware Clustering of XML Documents.- XIST: An XML Index Selection Tool.