Title Page -- Remerciements -- Acknowledgements -- Contents -- List of Figures -- List of Tables -- Listings -- Part I. Introduction -- Introduction -- Context and Scientific Motivation -- Context of the Thesis -- Motivations and Research Questions -- Main Results and Contributions -- Overall Content of the Thesis -- Content -- Lecture Guide -- Part II. Contributions -- Chapter 1. Towards a Convergence Between Web 2.0 and the Semantic Web -- Introduction -- The Semantic Web: Knowledge Representation and Data Interoperability on the Web -- Towards a Machine-readable Web -- Knowledge Representation for the Web with RDF(S) and OWL -- Identifying and Representing Resources using URIs and RDF -- Vocabularies and Ontologies for the Semantic Web: RDFS and OWL -- Querying RDF Data Using SPARQL -- The Semantic Web and the Web of Data -- Web 2.0: From Readers to Consumers -- A Collaborative Web -- Blogs, Wikis, Social Networking and Content Syndication -- Wikis and Personal Information Sharing -- Wikis and Collaborative Information Management -- RSS and Content Syndication -- Social Metadata: Tags and Folksonomies -- Content Sharing, Social Networking and Object-centred Sociality -- A Convergence Between Web 2.0 and the Semantic Web -- Summary of these Two Visions -- Web 2.0 Assets for the Semantic Web -- Semantic Web Assets for Web 2.0 -- Conclusion -- Chapter 2. SemSLATES: A Semantic Approach for Enterprise 2.0 -- Introduction -- Collaboration in the Enterprise: the Athena Project -- Motivations and Goals -- The Hermes Platform -- RSS for Information Integration and Sharing -- Weblogs for Content Publishing -- Wikis for Collaborative Knowledge Management -- Document Annotation and Information Retrieval -- Overall Integration of the Services -- Usage Statistics -- Issues of Enterprise 2.0 Ecosystems.

Information Fragmentation and Heterogeneity of Data Sources -- Knowledge Capture and Re-use -- Tags, Folksonomies and Information Retrieval -- Ambiguity Issues -- Heterogeneity Issues -- Lack of Organisation -- Clustering Approaches and their Limits -- Summary of the Different Issues -- SemSLATES: A Semantic Ecosystem for Enterprise 2.0 -- The SemSLATES Methodology -- A Social Semantic Middleware Architecture -- Representation Models, Services and Adaptors -- Producing Socio-structural Metadata From Existing Services -- Knowledge Capture and Ontology Population -- Tagging and Semantic Indexing -- Enhancing User Experience through Additional Services using RDF Data -- Related Work and Relevance of our Approach -- Conclusion -- Chapter 3. Ontologies for Enterprise 2.0 -- Introduction -- Modelling Socio-structural Metadata for Web 2.0 Services with SIOC -- Motivations -- Related Work -- The SIOC Ontology -- Main Classes and Properties of SIOC -- The SIOC Modules -- Relationships and Alignment with Existing Vocabularies -- DublinCore -- FOAF -- RSS 1.0 -- SKOS -- SIOC, FOAF and Social Data Portability -- Evaluation -- Modelling Domain Ontologies -- Requirements -- Representing Agents Using FOAF and Extensions -- Representing Geolocation -- Designing a Lightweight Role Ontology Using SKOS -- Representing Agents and their Roles -- Hierarchies of Roles' Facets -- Overall Integration of our Domain Ontologies -- Combining Tags and Ontologies with MOAT -- Tags, Folksonomies and Ontologies -- Emergent Semantics in Tagging Systems -- Modelling Tags Using Semantic Web Technologies -- Applications Combining Tagging and Semantic Web Technologies -- Representing the Meaning of Tags with MOAT -- The MOAT Ontology -- Comparison of MOAT with Other Ontologies -- Conclusion -- Chapter 4. Semantic Annotations and Collaborative Ontology Population -- Introduction.

Semantic Annotations of Web 2.0 Content -- An Automated Approach for Generating Socio-structural Metadata -- Generating Socio-structural Metadata from Enterprise 2.0 Services -- From RSS and Atom to SIOC -- Generating SIOC Metadata from Blogs and Wikis -- Generating SIOC Data on the Web -- UfoWiki: A Semantic Wiki for Ontology Population -- Related Work -- Platypus -- SemPerWiki -- Semantic MediaWiki -- IkeWiki -- OntoWiki -- AceWiki -- Goals and Principles of UfoWiki -- System Architecture -- Ontologies -- User-interfaces -- Generating and Storing RDF Annotations -- Using Ufowiki for Collaborative Ontology Population -- UfoWiki in Practice -- Integrating External Resources -- Evaluation -- UfoWiki and the State of the Art in Semantic Wikis -- Usage Statistics -- From Tagging to Semantic Tagging with MOAT -- Semantic Tagging Capabilities with MOAT Applications -- Software Implementations -- A Public MOAT Client for Drupal -- Improvements for the Hermes Platform -- LODr: Semantic Indexing for Existing Web 2.0 Content -- MOAT Servers and their Communication Protocols -- Evaluation -- MOAT in our Enterprise 2.0 Ecosystem -- Initiatives using MOAT -- Conclusion -- Chapter 5. Integrating and Using Distributed Semantic Annotations for Improving User Experience -- Introduction -- Storing Semantic Annotations in Enterprise 2.0 Ecosystems -- The Need for an RDF Store -- Requirements for an RDF Store in the SemSLATES Context -- Communication Protocols -- Enriching UfoWiki's Features -- Enhancing Information Discovery Using Semantic Macros -- Principles of UfoWiki's Semantic Macros -- Taking Data Provenance Into Account -- Combining Business Data and Socio-structural Metadata -- Using Context in Semantic Macros -- Advanced User Interfaces and Semantic Mash-ups -- Faceted Navigation -- Semantic Mash-ups.

Enabling Interoperability Between Applications Using Semantic Annotations -- Aggregating Blog Posts in Wikis Pages -- Ontology-based Indexing of RSS Feeds -- Projecting Knowledge to Enhance the Browsing Experience -- Semantic Search for Enterprise 2.0 -- Search and the Semantic Web -- Building an Ontology-based Semantic Search Engine -- Search Suggestions -- Concept and Implementation -- Applying Similar Principles to Web Data -- Conclusion -- Part III. Conclusion -- Conclusion -- Summary of our Contributions -- Perspectives and Thoughts Regarding the Semantic Web -- Part IV. Appendixes -- Prefixes and Namespaces used in this Thesis -- SPARQL Query Translating RSS Data to SIOC -- Business-related Annotations Generated with UfoWiki -- Socio-structural Annotations Generated with UfoWiki -- Analysis of DBpedia Properties in the Music Domain -- Bibliography.