Transcript Semantic Web

Semantic Web
World Wide Web Consortium
Keio University/Environmental
Information
Tatsuya Hagino
Semantic Web
by Tatsuya Hagino
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Table of contents
Semantic Web
Development of Web
Tim Berners-Lee's Goal of Web
Semantic Web is not HTML Web
What Semantic Web can do - Example Transation and Interaction
Semantic Web is Metadata Web
Semantic Web Architecture
Development of Web
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HTML
Separate structure and presentation
Accessibility
HTML 4.01 is the current and final version of HTML
HTML 4.01 has three DTDs
Strict
Transitonal
Frameset
XML
New Standard for Internet Document
Easy to process
Mixing documents using namespace
Generalize HTML ideas
Stylesheet: XSL, XSL-T
Hyperlink: XLink, XPointer
XML Schema for more powerful constraint
XML base Web document
XHTML
MathML
SVG
SMIL
Semantic Web
Next Generation Web
Machine can understand
Metadata space
Tim Berners-Lee's Goal of Web
• Human to human communication
• Information available for anytime,
anywhere and anyone.
• HTML
• Human to machine communication
• Machine solves problems
• Semantic Web
Semantic Web is not HTML Web
• HTML documents are for human to read and
understand.
• Metadata in Semantic Web is for machine to
process and understand.
• Metadata
• data for data
• RDF (Resource Description Framework) is
metadata of Web
• Metadata history
• PICS (Platform for Internet Content Selection)
What Semantic Web can do - Example •
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Plan a trip to Boston
Current Web
Use search engine to list airlines.
Check each airline for suitable flights, and decide the airline company.
Use search engine to list travel agencies.
Check each travel agency for price of the ticket, decide the travel agency, and actually make
a reservation.
Figure out how to buy the ticket (how to pay).
Check Narita express and reserve one.
Use search engine to list hotels at Boston.
Check each hotel, decide the hotel and make a reservation.
Print out the information about flight, Narita express and hotel.
Semantic Web
Ask to list available flights to Boston for any airline with low price. Pick one and it
automatically reserve the flight.
It also reserve Narita express automatically.
Then, it automatically search hotels at Boston which is convenient for the business. Pick one
and it automatically reserve the hotel.
All the information is put into your handheld device.
It may also put restaurant phone numbers and other useful information into the handheld
device.
Transation and Interaction
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Current Web
HTML form
CGI
HTML result page
Query result can only be understandable by
human.
Semantic Web
Metadata query (HTML form may generate it)
Metadata result (with HTML for human
readability)
Machine can understand and further process
Semantic Web is Metadata Web
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Machine communication each other
Apply the design principle of the Web
Interoperability
Evolution
Decentralization
Use RDF for metadata
Use RDF Schema for basic type definition
(class hierarchy)
• Use Ontology to cope with different vocabulary
Semantic Web Architecture