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Semantic Web

Semantic Web. BY: Josh Rachner and Julio Pena. What is the Semantic Web?. The semantic web is a part of the world wide web that allows data to be better represented by its actual meaning and content and provides access to collections of information that are in machine-readable formats

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Semantic Web

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  1. Semantic Web BY: Josh Rachner and Julio Pena

  2. What is the Semantic Web? • The semantic web is a part of the world wide web that allows data to be better represented by its actual meaning and content and provides access to collections of information that are in machine-readable formats “Most of the Web's content today is designed for humans to read, not for computer programs to manipulate meaningfully.” Berners-Lee, T, Hendler, J & Lassila, O ‘The semantic web’, Scientific American, May 2001

  3. Why use Semantic Web? • Make data machine-readable • Describe and infer about content • Provide ways to share and link data • Supply better search results

  4. Evolution of the Web

  5. Current Classifying Methods • Meta tags • XHTML/XML tags • Actual Web content What's the problem here?

  6. Example <item>Club</item> VS <item rdf:about="http://dbpedia.org/page/Club">Club</item>

  7. Link to Club Object

  8. Critics of Semantic Web • Better for specialized organizations and internal within companies • It's an idea that people have not come to terms with • Privacy and censorship of data • Redundancy of information

  9. Components of Semantic Web • eXtensible Markup Language (XML) • <item>Enzyme</item> • Resource Description Framework (RDF) • Uses N-triples (e.g. enzyme IS a protein) • Ontologies • Hierarchies of concepts • Rules for inference • If A = B, and B = C, then A = C

  10. Using OWL to Model Biological Knowledge Robert Stevens, MikelAranguen, Katy Wolstencroft, Ulrike Sattler, Nick Drummond, Matthew Horridge, Alan Rector

  11. Web Ontology Language (OWL) • OWL is a representative language; its main use is to make it easier for web content to be read by machines rather than just humans • There are three sublanguages of OWL: • OWL Lite – classification hierarchy w/ simple constraints • OWL DL – more expressive but is also limited • OWL Full – allows maximum expressiveness

  12. Phosphatase Ontology • Defined in terms of p-domain composition • Tyrosine phosphatase → Protein phosphatase → Phosphatase • Example: • 1 immunoglobin p-domain • 2 protein tyrosine phospatase p-domains

  13. Why OWL Description Logic • Description of classes and subclasses • Restriction to unary predicates and binary predicates - contains • Distinction between relationships of classes • Full boolean operators • Open world

  14. Overview • Semantic web is a possible solution for relating data and finding more meaning to information • It is a new concept but could really change the world wide web and how information is shared • Many organizations and companies currently use semantic web for research and commercial purposes

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