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This video was recorded at REASE. This is a one-hour video recording of the presentation of Natasha Noy at the KnowledgeWeb summer school 2005. It comprises either the video synchronized with the slides (but requires Quicktime, hence Windows or MacOS, otherwise the slides have to be switched manually). It provide a high-level overview on ontology mapping while the presentation of Steffen Staab provides more details and example systems. Table of Contents: Ontology Mapping and Alignment Lots of Overlapping Ontologies on the Semantic Web Example Definitions of School Creating Correspondences Between Ontologies Semantic Integration Tasks Reasons for Mismatches Types of Mismatches Language-level Mismatches Ontology-level Mismatches Ontology-level Mismatches: Examples Some of the Differences Categories of Mappings Mapping Discovery: Information Sources Using a Common Reference Ontology Solve the problem before it arises Using reference ontologies: Problems Using Lexical Information Using Ontology Structure Using External Sources User Input Using Prior Matches Mapping Composition Using Corpus of Matches Mapping Discovery: Information Sources Mapping Methods Rule-Based and Graph-Analysis Methods Graph-based Methods AnchorPrompt: Analyzing Graph Structure Machine Learning Approaches Probabilistic Approaches Reasoning and Theorem Proving Using Mappings Data Transformation Query Answering Generation of Ontology Extensions Challenges/Issues

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