Editorial Preface 1. Contextual and Conceptual Information Retrieval and Navigation on the Web 2. Automatic Invocation Linking for Collaborative Web-Based Corpora 3. WS-Query - A Framework to Efficiently Query Semantic Web Service 4. RDF-GL: A SPARQL-Based Graphical Query Language for RDF 5. Semantics-based Intelligent Indexing and Retrieval of Digital Images - A Case Study 6. Harvesting Intelligence in Multimedia Social Tagging Systems 7. User Profiles...