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The rise of the semantic web

The rise of the semantic web



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    Semantic Semantic Presentation Transcript

    • Having computers understand things more like human beings do
    • The current Web represents information using -natural language (English,Hungarian,Chinese). -graphics,multimedia, page layout.  Humans can process this easily - can deduce facts from partial information. - can create mental association. - are used to various sensory information.
    • Tasks often require to combine data on the Web. - Hotel and Travel information may come from different websites. - searches in different digital libraries. Humans can combine these information easily. - even if different terminologies are used. However , machines are ignorant. - partial information is unusable. - difficult to make sense from, e.g ,an image. - difficult to combine information automatically.
    • Semantic Web - coined by Tim Berners-Lee  inventor of WWW, URI, HTTP, HTML and Semantic Web.  “ a web of data that can be processed directly and indirectly by machines . “  to access the Web more intelligently and perform tasks on behalf of users .  evolution of the current Web by enabling users to find, share, and combine information more easily .
    • Why not just google ? Currently, users search for data on the Web by asking questions that are of the form : “which documents contain these words and phrases ” The Semantic Web will involve more related questions , relationships, and trust . Instead of word matching the web will be able to show related items showing new relationships.
    • Semantic links
    • Web of Data
    • Architecture of Semantic Web
    • RDF (Resource Desciption Framework) RDF is the foundation of the semantic web . RDF = a simple conceptual data model (GRAPH). RDF model = set of RDF triples . (subject, verb, object). A Sentence Jane sells books. subject predicate object
    • RDF - Resource Resource is anything that has identity (URI). -Jane, Book.  (a govt agency, a human , an abstract concept) RDF – Description  several statements describing the resource. RDF – Framework It is needed to enable humans and machines to make and understand statements . - Natural languages like English.
    • Human brain uses logic Mary is a mother. A mother is a parent. Therefore, Mary must be a parent. ONTOLOGY Precise explanation of terms and reasoning in a subject area. - Computers can act as if they understand the information they are handling. The facts stored in the semantic web will change over time as the true state of world changes.