1. Semantic Web ０６ T ０００６ YOSHIYUKI Osawa

2. Problem of current web  limits of search engines Most web pages are only groups of character strings. Most web pages are only groups of character strings. It is difficult for users to obtain information which they need really.

3. Semantic web  Web pages have meaning of the data. → meta data → meta data  The precision of the search rises.  Specific kind of information can be collected.

4. Meta data  Data of data  Example ・ author ・ date ・ description ・ keywords … etc.

5. Describe meta data  XML (eXtensible Markup Language) ・ Original tag ・ Namespace in XML

6. RDF (Resource Description Framework)  Method of describing meta data  Triple ・ subject (resource) ・ predicate (property) ・ object (value of property)

7. Example of RDF  New York has a postal abbreviation which is NY. ・ subject → urn:states:New%20York ・ predicate → http://purl.org/dc/terms/alternative ・ object → NY

8. Example of RDF subject predicate object

9. OWL (Web Ontology Language)  Definition of Network of vocabulary ・ synonym ・ antonym ・ wide sense ・ narrow sense

10. Example “ fast ” “ quick ” synonym recognize computer “ hot ” “ cold ” antonym

11. Example2 “ meat ” “ food ” “ beef ” wide sense narrow sense “ fish ”

12. References  http://www.kensetsu21.com/calsjap an/lectures/semantic/001.pdf http://www.kensetsu21.com/calsjap an/lectures/semantic/001.pdf http://www.kensetsu21.com/calsjap an/lectures/semantic/001.pdf  http://ja.wikipedia.org/wiki/Resource _Description_Framework http://ja.wikipedia.org/wiki/Resource _Description_Framework http://ja.wikipedia.org/wiki/Resource _Description_Framework  http://xml.fujitsu.com/jp/comment/2 003_6/06_04.html http://xml.fujitsu.com/jp/comment/2 003_6/06_04.html http://xml.fujitsu.com/jp/comment/2 003_6/06_04.html  http://www.gengokk.co.jp/thebun.ht m http://www.gengokk.co.jp/thebun.ht m http://www.gengokk.co.jp/thebun.ht m