Semantic WebSemantic Web

Ing. Federico Chesani

18 Febbraio 2010

About the content

©Tim Berners-Lee, http://www.w3.org/2007/09/map/main.jpg

Knowledge

Representation

About the content

Representation

Web

Semantic

Web

Final essay

• Any essay, small project, paper deep

investigation ...

• ... but possibly (!) related with your research

fieldfield

• .. and (possibly) not trivial!

Suggestion:

Semantic Web and KR

• Semantic Web is about representing knowledge ...

• ... with a strong desire of interoperability

• Tools for KR, developed within the SW initiative can be effortless used to represent knowledge ...

• ... With the advantage that you are ready (if you want) to share these information!

Representing Knowledge

• It is a very difficult task

• It is a form of “art”

• Requires strong formal basis ...

• ... as well as a practical approach to be • ... as well as a practical approach to be

successfull

Who is using SW?

Today a healthy industry is growing around SW:

• startups (Top Quadrant, C&P, Talis, Zepheira,

Cambridge Semantics, Garlik, OpenLink, iSOCO,

Franz Inc., Sandpiper, Aduna, Faviki, Twine, …)Franz Inc., Sandpiper, Aduna, Faviki, Twine, …)

• big corporations offering tools (IBM, Oracle, HP,

Adobe, Profium,…)

• even more are using it in some way or other

(Novartis, Sun, Eli Lily, EDF, Yahoo!, Google, FAO,

Bankinter, …)

Source: Ivan Herman

Forecasts?

By 2012, 80% of public Web sites will use some level of semantic hypertext to create SW documents […] 15% of public Web sites will use more extensive Semantic Web-based ontologies to create semantic databases

[Gartner report, May 2007]

PWC believes a Web of data will develop that fully augments the document Web of today. You’ll be able to find and take pieces of data sets from different places, aggregate them without warehousing, and analyze them in a more straightforward, powerful way than you can now.

[PriceWaterhouseCoopers Spring ‘09 Technology Forecast, May 2009]

Source: Ivan Herman

Few interesting sites ...

• DBpedia, extracting sematnic knowledge from Wikipedia http://dbpedia.org/About

• Improved search in Pubmed, via ontologies http://www.gopubmed.org/

• SWSE, a Semantic Web Search Engine http://www.swse.org/

• SINDICE, http://sindice.com/

• NYTimes embracing the Semantic Web approach http://open.blogs.nytimes.com/tag/semantic-web/?scp=1-b&sq=semantic+web&st=nyt

• The Friend Of A Friend (FOAF) ontology, to start with if you

want to add semantic content to you home page

http://xmlns.com/foaf/spec/

Few readings ...

Textbooks:

• Knowledge Representation and Reasoning, R. J. Brachman and

H.J. Levesque, Morgan Kaufmann 2004.

• G. Antoniu and F. van Harmelen: Semantic Web Primer, 2nd • G. Antoniu and F. van Harmelen: Semantic Web Primer, 2nd

edition in 2008

• D. Allemang and J. Hendler: Semantic Web for the Working

Ontologist, 2008

Few readings ...

Papers, tutorials and howto:

• RDF Primer, http://www.w3.org/TR/2004/REC-rdf-primer-

20040210/

• OWL Guide http://www.w3.org/standards/techs/owl#w3c_all

And, above all, the W3C activity:

• http://www.w3.org/2001/sw/

• http://www.w3.org/2001/sw/wiki/Main_Page

Thank you very much for the

attention!!!

Federico ChesaniLIA – DEIS

Facoltà di Ingegneria

Università di Bologna

federico.chesani@unibo.it