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This Book Constitutes The Thoroughly Refereed Post-proceedings Of The Second International Workshop On Semantics In Databases, Held In Dagstuhl Castle, Germany, In January 2001. The 10 Revised Full Papers Presented Together With An Introduction By The Volume Editors Were Carefully Selected During Two Rounds Of Reviewing. Among The Aspects Of Database Semantics Discussed Are Semantic Constraints, Paraconsistency, Logic Foundations Of Databases, Er Modeling, Type Hierarchies, Null Values, Consistency Enforcement, Logic-based Pattern Languages, And Semantic Classification Of Queries. Among The Classes Of Databases Dealt With Are Deductive Databases, Relational Databases, Distributed Information Systems, And Tree-structured Data. Semantics In Databases / Leopoldo Bertossi [and Others] -- Characterizing And Computing Semantically Correct Answers From Databases With Annotated Logic And Answer Sets / Pablo Barcelo, Leopoldo Bertossi And Loreto Bravo -- Towards Unifying Semantic Constraints And Security Constraints In Distributed Information Systems / Joachim Biskup And Barbard Sprick -- Historical And Computational Aspects Of Paraconsistency In View Of The Logic Foundation Of Databases / Hendrik Decker -- Soft Constraints And Heuristic Constraint Correction In Entity-relationship Modelling / Sven Hartmann -- Characterization Of Type Hierarchies With Open Specification / Stephen J. Hegner -- Null Values In Raltional Databases And Sure Information Answers / Hans-joachim Klein -- Consistency Enforcement In Databases / Sebastian Link -- Automata- And Logic-bases Pattern Languages For Tree-structured Data / Frank Neven And Thomas Schwentick -- Cardinality Constraints In Disjunctive Deductive Databases / Dietma Seipel And Ulrich Geske -- Semantic Classifications Of Queries To Relational Dataases / Jose Maria Turull Torres. Leopoldo Bertossi ... [et Al.], Eds. Includes Bibliographical References And Index.