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Semantic Web Presented by: Edward Cheng Wayne Choi Tony Deng Peter Kuc-Pittet Anita Yong.

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Presentation on theme: "Semantic Web Presented by: Edward Cheng Wayne Choi Tony Deng Peter Kuc-Pittet Anita Yong."— Presentation transcript:

1 Semantic Web Presented by: Edward Cheng Wayne Choi Tony Deng Peter Kuc-Pittet Anita Yong

2 Agenda  Introduction  Semantic Web components  Example  Pros/Cons

3 The Current World Wide Web  Network of hypertext documents containing text, images, audio, and video  Is readable and understandable by humans, but only readable (via parsing) by machines  What is missing is this understanding of the semantics  For example vs.

4 Semantics  The definition of semantics is meaning  The idea is to give a keyword (or a subject) a definition  These definitions are then related to objects  Humans do this easily but often make mistakes, so to have computers perform these operations would eliminate mistakes  Does not mean that there are no mistakes in the algorithms used, but idea is that using the logic of Semantic Web these errors could be caught

5 What is Semantic Web?  Tim Berners-Lee’s vision of a network of data fully understandable by machines without requiring human intervention  Standardized way of defining relations between things that have meaning  A globally and semantically linked network of information underlying the current Web

6 Wedding Cake

7 Components  Unicode:  A standard and universal way of encoding text  URI (Uniform Resource Identifier) :  A unique string identifying a name or resource  XML (Extensible Markup Language) :  Used to describe and communicate data

8 Components  Namespaces:  A way of encapsulating a vocabulary  XML Query:  Used to extract data from an XML document  XML Schema:  A description of an XML document, imposing constraints on its content and structure

9 Components  RDF Model (Resource Description Framework) :  Makes a statement about a resource using a (subject, predicate, object) URI triple  (,,  Santa is interested in Wikipedia’s dieting entry

10 Ontology  An ontology is a data model that describes individuals, classes, attributes, and relations  RDF schema is the base RDF ontology, putting constraints on an RDF subject’s relationship to an object for a given predicate  foaf:person foaf:knows foaf:person  foaf:image foaf:knows foaf:person  OWL (Web Ontology Language):  A more complicated and expressive ontology than RDF Schema  Three forms: OWL Lite, OWL DL, OWL Full

11 Querying  A Semantic Web query connects to multiple RDF dataset agents to gather information, and returns the set of best matched results. Cheapest Support Labour? North American Firm A North American Firm B Overseas Firm A Agent

12 Bob: Book doctors appointment Target: Person Type: Patient Type: Bob Type: Doctor Type: Rick Target: Hospital Employee Target: Schedule Time Type: Sched Time

13 Pros  Searching with semantic meaning and relations  Agents (programs) acting as intermediaries to meet user needs  Better knowledge management as data is connected in meaningful ways

14 Cons  Need to maintain two different versions of web content – a machine readable version and a human interaction version  Only useful if Semantic Web is adopted by the masses

15 Questions?

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