S S TS G SO : SS FSS S F

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????? ??????S?????????? ???????????S
??????T????????S???????????? ???G????? S????O?
?????S??S ?????F???S?S S? ??F???? ??????????

• S???S????G???S ?S??S ??? ??F????S ??????T???S
• ???????O? ??T?G???S
• S??????S ????????S

??????? 2 F?????????? 2005
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S???S????G???S ?S??S

• 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 cooperation." -- Tim Berners-Lee, James
  Hendler, Ora Lassila, The Semantic Web,
  Scientific American, May 2001

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• Berners-Lees Architecture

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S???S????G???S ?S??S - S?????

• ? ???????G?? ???S ??G??S???? ??S?? G?? ???
  ???????G? ???????O?.
• ? ????? ???S????S? ??S ????????S?S ?O? ???SO???O?
  ?????F???O?, ? ???????OS? ?????????????O?
  ?F????GO? ??? ? ??G??S??? ???????G?
  ???????O?,???S???????O? ??? ??????S???O?
  ???????O?.

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S???S????G???S ?S??S -?????????????

• THE METADATA LAYER
• THE SCHEMA LAYER
• THE LOGICAL LAYER

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??????G??S

• ? p?? ap?de?t?? ???sµ?? µ?a? ??t?????a? e??a? t??
  Gruber (1993) s?µf??a µe t?? ?p??? µ?a ??t?????a
  e??a? µ?a ep?s?µ? p??d?a??af? µ?a? s???????
  µ?sa se µ?a s???e???µ??? pe?????.

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??????G??S - S?????

• ????????S??S ??S G?OS?S
• ???T?S??????? ??S G?OS?S

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??????G??S (S???????)

• ??????? ???T????S? ??G??OS?
• ?????????S?
• ?????????? ?? ??G??O?????? S? ????S??S

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??F????S ???G??F?S

• ? ?st?? e??a? ??a a????t? s?st?µa ?a?
  ?p???sd?p?te µp??e? ?a p??s??se? p????f???e?. ??
  ??f?a??? ?p???af?? ?a d?asfa??s??? t?? a???p?st?a
  t?? p????f?????.

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????????S ?????S??S

• ??t?µat? a?a?????? d??t?a??? ?p??es?a?.
• ??t?µat? ep????s? d??t?a??? ?p??es?a?.
• ??t?µat? s???es? ?a? ?e?t?????a d??t?a???
  ?p??es?a?.
• ??t?µat?? ??e???? e?t??es?? d??t?a??? ?p??es???

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S???S????G??? ??G?????

• Term lists.
• Metadata-like models.
• Classification and categorization schemes.
• Relationship models.
• Metadata content standards.
• Domain-specific content markup languages.
• General knowledge representation languages.

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??????? ????????S

• ???S ?????S ????G?S?S ??? S????G?S ?????F????S.
• S???????S? ??? S????G?S??
• ????T??? ????G?S? S? ?S???????S
• ?????????
• ??T?????? ????????
• ???F???????????

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??????S ???????S?S

• ?e t?? ?a??te?? ??????s? t?? p????f???a? µ?s?
  ??sa???? ?a? ??t??????? µp????? ?a pa??????
  ?a??te?a ?a? p???t???te?a ap?te??sµata. ?p?s?? ?
  ???st?? ?a e??a? p???? ??a??? ?a d?aµ??f??e? p??
  e?e??e?a e??t?µata, ??? apa?a?t?ta µe
  ???e??-??e?d?? ? µe te?est?? Boolean ?a? ? µ??a??
  a?a??t?s?? ?a t?? f???e? ??a??p???t???
  ap?te??sµata af?? ?a µp??e? ?a ta ?ata???se?.

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ROBUST HYPERLINKS

• G?a ?a ???e? ??a? ?pe?s??desµ?? robust p??pe? ?a
  s?µpe????f?e? se a?t??, µa?? µe t? URI (Uniform
  Resource Identifier) ??a µ???? ap? t? pe??e??µe??
  t?? e????f??. ????µe d??ad? ??a µ?a lexical
  signature, µ?a ??f?a?? ?p???af? d??ad? p??
  a?a??????e? t?? s???e???µ??? ?st?se??da ap? t?
  pe??e??µe?? t??.

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S???S????G???S ?S??S ??? ??F????S ??????T???S

• ? s?µas????????? ?st?? p??sf??e? ??e? d??at?t?te?
  ??????s??, d?a?e???s?? ?a? d???es?? t?? s???????
  t?? ?.?. ??t? s?µa??e? ?t? µe t?? ???s? t??
  d??at?t?t?? p?? p??sf????? ta s?µas????????
  e??a?e?a, µp????? ?a pa?????? ??e? ?p??es?e?, p??
  ??????a ?a? p?? a???p?sta, µe t?? e????st?
  a????p??? p??sp??e?a.

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UC Berkeley Digital Library Project

• Sta p?a?s?a ???p?? a?t?? t?? p?????µµat?? ??e?
  ???e? a??et? ??e??a ?s?? af??? t?? pa???s?as?
  e??????. S??p?? t?? ??e??a? a?t?? e??a? ?a
  pa???eta? p??sßas? se µe???e? s??????? ap?
  e????e? µ?sa ap? p?????s? ?a? a?a??t?s?.
• ?a ???s?µ?p??????? µe???e? s??????? ap? e????e?
  ?? ded?µ??a ??a ??ass??? p??ß??µata ape?????s??
  se ??e?t???????? ?p?????st?? ?p?? ? a?a?????s?
  a?t??e?µ????

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BLOBWORLD

• ?? Blobworld e??a? ??a s?st?µa ??a a???t?s?
  e?????? ßas?sµ??? st? pe??e??µe?? t???. ??t? t?
  pet??a??e? ???????ta? a?t?µata ???e e????a se
  pe?????? p?? a?t?p??s?pe???? a?t??e?µe?a ? µ???
  ap? a?t??e?µe?a. ?ts? µp????? ?? ???ste? ?a
  d?at?p?s??? e??t?µata p?? ßas????ta? sta
  a?t??e?µe?a p?? pe??????? ?? f?t???af?e?.

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Browsing Large Image Collections

• ??a ???? s?st?µa p?? ??e? a?apt???e? e??a? ??a
  t?? e????? p?????s? a??µesa se s??????? e??????.
  St?? s???e???µ??? pe??pt?s? ?p???e? ??a demo ap?
  t? Fine Arts Museum of San Francisco.

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S??????S????