Toward The Semantic Deep Web


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  • This was a very concise but informative summary of text data analysis.

    I liked it because it provided both a means of classifying semantic web data, and also showed how the the methodology could be used for more than classification only.
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Toward The Semantic Deep Web

  1. 2. What The Problem? <ul><li>Consider a typical web page </li></ul><ul><li>Mark-up consists of: rendering information </li></ul><ul><li>Semantic content is accessible to humans but not (easily) to computers … </li></ul><ul><li>Machine requires Natural Language understanding </li></ul>
  2. 3. Our Goal <ul><li>Accessing the deep web by various web technologies </li></ul><ul><li>e.g. XML Schema, RDF, OWL </li></ul><ul><li>Represent the data in a machine accessible way </li></ul><ul><li>Enriching ontologies using this data </li></ul>
  3. 4. The Semantic Web The Semantic Web is an extension of the current web in which information is given well-defined meaning , better enabling computers and people to work in co-operation . [Tim Berners-Lee , 2001]
  4. 5. Accessing semantic deep web <ul><li>Two main approaches- </li></ul><ul><li>Ontology plug-in search </li></ul><ul><li>Deep web service annotation </li></ul><ul><li>Both approaches require a semantic deep web crawler or bot. </li></ul>
  5. 6. Ontology plug-in search Referent Form Search engine replies refers to evokes Concept “ Jaguar“
  6. 7. Ontology plug-in search <ul><li>Two processes- </li></ul><ul><li>Harvesting concepts or deep web form attribute. </li></ul><ul><li>Iteratively link this concepts to build enriched ontology. </li></ul>This ontology provides- - domain specific terms. - useful relationship and further related information.
  7. 8. Deep web service annotation How to represent data in a machine accessible way? <ul><li>Semantic data signature represented in computational graph </li></ul><ul><li>-XML </li></ul><ul><li>-RDF </li></ul><ul><li>-RDF Schema </li></ul><ul><li>-OWL (Web ontology language) </li></ul>
  8. 9. The Semantic Web Layers Standard Standard Standard
  9. 10. XML <ul><li>User definable and domain specific markup </li></ul><course date= “...” > <title> ... </title> <teacher> ... </teacher> <name>...</name> <http>...</http> <students> ... </students> </course> File Format Tree Structure <ul><li>Why not use XML to represent ontologies? </li></ul><ul><li>XML makes no commitment on: </li></ul><ul><li>Domain specific ontological vocabulary </li></ul><ul><li>Conceptual meaning </li></ul>course teacher title students name http =
  10. 11. RDF(Resource Description Framework) <ul><li>A mechanism for annotating data and resources </li></ul><ul><li>RDF is a graphical formalism </li></ul><ul><ul><li>-for representing metadata about Web resource </li></ul></ul><ul><ul><li>-for describing the semantics of information in a machine- accessible way </li></ul></ul>
  11. 12. RDF(S): RDF Schema <ul><li>Defines vocabulary for RDF </li></ul><ul><li>Organizes this basic vocabulary terms and the relations between those terms </li></ul><ul><ul><li>-Class, subClassOf, type </li></ul></ul><ul><ul><li>-Property, subPropertyOf </li></ul></ul><ul><ul><li>-domain, range </li></ul></ul>Has Supervisor Person subClassOf subClassOf type domain range type
  12. 13. OWL :Web Ontology Language <ul><li>Ontologies standardize and formalize the meaning of words through concepts </li></ul><ul><li>It helps softbots by serving knowledge about synonyms, antonyms, semantic relationship between concept. </li></ul>
  13. 14. Conclusion Ontology helps to find the concepts. Semi-automatic ontology generation from the deep web, quality of ontology measurement(reliability) is challenging. It requires natural language processing.
  14. 15. Reference <ul><li>Y. Sure and R. Studer. Vision for Semantically-Enabled Knowledge Technologies. Online at: KTweb -- Connecting Knowledge Technologies Communities, 2003. </li></ul><ul><li>Search on the semantic web IEEE Computer october 2005. </li></ul><ul><li> </li></ul><ul><li>. M. Dean and G. Schreiber, OWL Web Ontology Language Reference , Feb. 2004; TR/2004/REC-owl-ref-20040210/. </li></ul><ul><li>T. Berners-Lee, J. Hendler, and O. Lassila, “ The Semantic Web ,” Scientific American , May 2001 </li></ul>