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Table of Contents

Invited Papers.- Open Problems in Data-Sharing Peer-to-Peer Systems.- Approximations in Database Systems.- Bioinformatics Adventures in Database Research.- Reasoning about XML Schemas and Queries.- Incremental Validation of XML Documents.- Typechecking Top-Down Uniform Unranked Tree Transducers.- Structural Properties of XPath Fragments.- On Reasoning about Structural Equality in XML: A Description Logic Approach.- Aggregate Queries.- Containment of Aggregate Queries.- Auditing Sum Queries.- CRB-Tree: An Efficient Indexing Scheme for Range-Aggregate Queries.- Optimal Range Max Datacube for Fixed Dimensions.- Query Evaluation.- Processing XML Streams with Deterministic Automata.- Deciding Termination of Query Evaluation in Transitive-Closure Logics for Constraint Databases.- Query Rewriting and Reformulation.- Data Exchange: Semantics and Query Answering.- Reformulation of XML Queries and Constraints.- New Rewritings and Optimizations for Regular Path Queries.- Database Interrogation Using Conjunctive Queries.- Semistructured versus Structured Data.- On the Difficulty of Finding Optimal Relational Decompositions for XML Workloads: A Complexity Theoretic Perspective.- Generating Relations from XML Documents.- Query Containment.- Containment for XPath Fragments under DTD Constraints.- XPath Containment in the Presence of Disjunction, DTDs, and Variables.- Decidable Containment of Recursive Queries.- Containment of Conjunctive Queries with Safe Negation.- Consistency and Incompleteness.- Probabilistic Interval XML.- Condensed Representation of Database Repairs for Consistent Query Answering.- Typing Graph-Manipulation Operations.- Characterizing the Temporal and Semantic Coherency of Broadcast-Based Data Dissemination.- Data Structures.- An Efficient Indexing Scheme for Multi-dimensional Moving Objects.- Nearest Neighbors Can Be Found Efficiently If the Dimension Is Small Relative to the Input Size.