Contents
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1 Purpose
2 Relationship to the Hypertext Web
2.1 Markup
2.2 Descriptive, and extensible
3 Skeptical reactions
3.1 Practical feasibility
3.2 An unrealized idea
3.3 Censorship and privacy
3.4 Doubling output formats
4 Components
4.1 XML, XML Schema, RDF, OWL, SPARQL
4.2 RDF - URI, XML, namespaces
5 Projects
5.1 FOAF
5.2 SIOC
5.3 SIMILE
5.4 Linking Open Data
6 Tools
6.1 Browsers
7 Services
7.1 Notification Services
7.2 Semantic Web Ping Service
7.3 Piggy Bank
8 See also
9 References
10 Notes
11 External links