Part I Colleagues and Historical Roots.- A Retrospective on Semantics and Interoperability Research.- Semantic Web and Applied Informatics: Selected Research Activities in the Institute AIFB.- Effectiveness and Efficiency of Semantics.- Knowledge Engineering Rediscovered: Towards Reasoning Patterns for the SemanticWeb.- Semantic Technology and Knowledge Management.- Tool Support for Ontology Engineering.- Part II Academic Legacy.- Combining Data-Driven...