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The semantic web is an evolving extension of the World Wide Web in which web content can be expressed not only in natural language, but also in a format that can be read and used by software agents, thus permitting them to find, share and integrate information more easily.[1] It derives from W3C director Sir Tim Berners-Lee's vision of the Web as a universal medium for data, information, and knowledge exchange.

Contents [hide] 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

is an evolving extension of the > World Wide Web > in which > web content > can be expressed not only in > natural language > , but also in a format that can be > read > and used by > software agents > , thus permitting them to find, share and > integrate > information more easily. > [1] > It derives from > W3C > director > Tim Berners-Lee 's vision of the Web as a universal medium for > data > , > information > , and > knowledge > exchange. >

The Web Ontology Language (OWL) is a language for defining and instantiating Web ontologies.[1] An OWL ontology may include descriptions of classes, along with their related properties and instances. OWL is designed for use by applications that need to process the content of information instead of just presenting information to humans. It facilitates greater machine interpretability of Web content than that supported by XML, RDF, and RDF Schema (RDF-S) by providing additional vocabulary along with a formal semantics. OWL is based on earlier languages OIL and DAML+OIL, and is now a W3C recommendation.