Invited Talks -- Information and Influence in Social Networks -- Learning, Logic, and Probability: A Unified View -- Knowledge Acquisition -- KARaCAs: Knowledge Acquisition with Repertory Grids and Formal Concept Analysis for Dialog System Construction -- Capturing Quantified Constraints in FOL, Through Interaction with a Relationship Graph -- Assisting Domain Experts to Formulate and Solve Constraint Satisfaction Problems -- Knowledge Acquisition Evaluation Using Simulated Experts -- Stochastic Foundations for the Case-Driven Acquisition of Classification Rules -- From Natural Language to Formal Proof Goal -- Reuse: Revisiting Sisyphus-VT -- Ontology Engineering -- Role Organization Model in Hozo -- Verification and Refactoring of Ontologies with Rules -- Ontology Selection for the Real Semantic Web: How to Cover the Queen’s Birthday Dinner? -- Ontology Engineering, Scientific Method and the Research Agenda -- Ontology Learning -- Ontology Enrichment Through Automatic Semantic Annotation of On-Line Glossaries -- Discovering Semantic Sibling Groups from Web Documents with XTREEM-SG -- Designing and Evaluating Patterns for Ontology Enrichment from Texts -- Ontology Mapping and Evolution -- Semantic Metrics -- Matching Unstructured Vocabularies Using a Background Ontology -- Distributed Multi-contextual Ontology Evolution – A Step Towards Semantic Autonomy -- An Evaluation Method for Ontology Complexity Analysis in Ontology Evolution -- Semantic Search -- Semantic Search Components: A Blueprint for Effective Query Language Interfaces -- SemSearch: A Search Engine for the Semantic Web -- Rich Personal Semantic Web Clients: Scenario and a Prototype -- User Interfaces -- i dee: An Integrated and Interactive Data Exploration Environment Used for Ontology Design -- Evaluating a Thesaurus Browser for an Audio-visual Archive -- Knowledge Discovery -- Frequent Pattern Discovery from OWL DLP Knowledge Bases -- Engineering and Learning of Adaptation Knowledge in Case-Based Reasoning -- A Methodological View on Knowledge-Intensive Subgroup Discovery -- Iterative Bayesian Network Implementation by Using Annotated Association Rules -- Semantics from Networks and Crowds -- Multilayered Semantic Social Network Modeling by Ontology-Based User Profiles Clustering: Application to Collaborative Filtering -- Towards Knowledge Management Based on Harnessing Collective Intelligence on the Web -- A Formal Approach to Qualitative Reasoning on Topological Properties of Networks -- Applications -- Towards a Knowledge Ecosystem -- A Tool for Management and Reuse of Software Design Knowledge -- The ODESeW Platform as a Tool for Managing EU Projects: The Knowledge Web Case Study.