Invited Talks -- Tools and Techniques in Qualitative Reasoning about Space -- A Simple but Formal Semantics for XML Manipulation Languages -- Algorithmic Definability and Completeness in Modal Logic -- Regular Articles -- A Probabilistic Temporal Logic That Can Model Reasoning about Evidence -- An Algorithm for Generating Nash Stable Coalition Structures in Hedonic Games -- Conjunctive Queries with Constraints: Homomorphism, Containment and Rewriting -- Enhancing Dung’s Preferred Semantics -- On the Distance of Databases -- On the Existence of Armstrong Data Trees for XML Functional Dependencies -- Polymorphism in Datalog and Inheritance in a Metamodel -- Possibilistic Semantics for Logic Programs with Ordered Disjunction -- Semantic Web Search Based on Ontological Conjunctive Queries -- Semantically Characterizing Collaborative Behavior in an Abstract Dialogue Framework -- The Relationship of the Logic of Big-Stepped Probabilities to Standard Probabilistic Logics -- Theoretical Foundations for Enabling a Web of Knowledge -- Towards Controlled Query Evaluation for Incomplete First-Order Databases -- Bagging Decision Trees on Data Sets with Classification Noise -- Evolving Schemas for Streaming XML -- ONTO-EVO A L an Ontology Evolution Approach Guided by Pattern Modeling and Quality Evaluation -- Towards a Paradoxical Description Logic for the Semantic Web -- Towards a Unified Model of Preference-Based Argumentation -- Two Complementary Classification Methods for Designing a Concept Lattice from Interval Data.