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Slides from the presentation at Munich in 2010. Slide have been presented to digital humanities experts and scholars participating the COST A32 action (2006-2010)
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Linked Open Data ... and why you should care.Christian Morbidoni <[email protected]>
This work is licensed under a Creative Commons Attribution-NoDerivs 2.5 Italy
SeMediaUniversità Politecnica delle Marche
Sunday, November 21, 2010
The Semantic Web is...
- A W3C initiative. The goal is to evolve the “classic” Web.
- A big community of researchers and developers
- A set of languages for data and knowledge representation
- Formal models
- A growing set of software tools supporting a “smarter” Web
Sunday, November 21, 2010
WWW: basic components
- HTTP to trasfer data
- GET /index.html
- URLs to identify resources
- http://www.google.com/search?source=ig&hl=en&rlz=&=&q=semantic+web
- HTML to represent resources
- <html><head><title>…
- GCI, scripting, etc. to develop applications
Sunday, November 21, 2010
The “dumb” Web
- The Web is great as it contains a lot of information, and sometimes it is easy to find what you look for
- But sometimes it behaves not so smartly
- We find out that Information that should be naturally correlated... in the and are not
Sunday, November 21, 2010
The conference example
Sunday, November 21, 2010
The conference example
Sunday, November 21, 2010
The conference example
Sunday, November 21, 2010
The conference example
“Which one is hosting the ESWC?!??!”
“Why the aldemar web site does not even know that the ESWC exists?!?!”
Sunday, November 21, 2010
Dumb web in action...
Finally after a lot of clicks I found a couple of hotels for my budget
Sunday, November 21, 2010
Dumb web in azione ...... but what is the closest to the conference
venue?
Sunday, November 21, 2010
Dumb web in azione ...... but what is the closest to the conference
venue?
Sunday, November 21, 2010
Dumb web in azione ...... but what is the closest to the conference
venue?
Sunday, November 21, 2010
Dumb web in azione ...
• After a lot of copy/paste into goole maps i find out
• .. but what a pain. After all it is a “mechanical” work and ...
• ... probably other people need to to the very same thing ...
•Why should I do it? Why not a machine?!?!?
Sunday, November 21, 2010
A bit of smartness finally ...
Sunday, November 21, 2010
A bit of smartness finally ...
Greek hotel owner
There are many systems like this. Why should I put the same info again and againg. And modify them all
once I need to change them.
Sunday, November 21, 2010
So?
- We do not need more intelligent applications ...
- We just need to let them find the right data at the right time!
Sunday, November 21, 2010
Dumb Web revisited...
- We want addresses to be immediately recognized as such by a machine ...
- ... than we want them to be sent automatically to gmaps (with one click)
- ... but we also what this to happen without a priori agreement
Sunday, November 21, 2010
semantics is hidden, only humans (and not all of them) can extract it from documents
Sunday, November 21, 2010
machines are helpless
Sunday, November 21, 2010
unless...
Sunday, November 21, 2010
we explicitly say to machines what we are talking about
... and we keep it simple...
... and we use simple, structured language that they can understand.
Sunday, November 21, 2010
This is what the Semantic Web is all about.
The Resource Description Framework (RDF) is the basic instrument
Sunday, November 21, 2010
Sunday, November 21, 2010
Information can be useless without a priori knowledge
Machines needs at least some vocabulary and basic rules of the game
That is where ontologies come in
Sunday, November 21, 2010
Ontologies: vocabularies for your domain
Source
Artistic Medium
FrescoMosaic
Manuscript Book
sub class of
sub class of
sub class of
sub class ofsub class of
Person
Artist
Caliph
sub class of
sub class of
Sunday, November 21, 2010
Ontologies: vocabularies for your domain
Source
Artistic Medium
FrescoMosaic
Manuscript Book
sub class of
sub class of
sub class of
sub class ofsub class of
Person
Artist
Caliph
sub class of
sub class of
Divine Comedy
type
Dante Alighieri
type
San PetronioFresco
type Prophet Muhammad
type
Sunday, November 21, 2010
Ontologies: vocabularies for your domain
Source
Artistic Medium
FrescoMosaic
Manuscript Book
sub class of
sub class of
sub class of
sub class ofsub class of
Person
Artist
Caliph
sub class of
sub class of
Divine Comedy
type
Dante Alighieri
type
San PetronioFresco
type Prophet Muhammad
type
has author
depicts
Sunday, November 21, 2010
Linking ?
The Web is great because it is so simple to jump from a web page to the others
With the Semantic Web it should be easy to jump from a database to an other:
Image separated clouds of data that are ready to interoperate with each other ...
as if it was a unique world wide database
Sunday, November 21, 2010
Web of Documents vs. Web of Data
Presentation Layer
Data representation layer
Hyperlinks
?
RDF Data RDF Data RDF Data RDF Data
???
semantically defined relations ???
Web Infrastructure
Sunday, November 21, 2010
RDF and Web pages
Sunday, November 21, 2010
RDF and Web pages
RDF Data
http://example.com/home.htm http://example.com/home.rdf
Web Browser / Application
Sunday, November 21, 2010
RDF and Web pages
RDF Data
http://example.com/home.htm http://example.com/home.rdf
Web Browser / Application
RDF Data
Web Browser / Application
HTTP:GET http://example.com/home/CONTENT-TYPE application/rdf+xml
HTTP:GET http://example.com/home/
CONTENT-TYPE text/html
Sunday, November 21, 2010
RDF and Web pages
RDF Data
http://example.com/home.htm http://example.com/home.rdf
Web Browser / Application
<html> ...... <rdf> ........ </rdf> ....... </html>
RDF Data
RDF Data
Web Browser / Application
HTTP:GET http://example.com/home/CONTENT-TYPE application/rdf+xml
HTTP:GET http://example.com/home/
CONTENT-TYPE text/html
Sunday, November 21, 2010
Sunday, November 21, 2010
DONATELLO FLORENCEis from
BRUNELLESCHI
worked with
made
DAVID
FROM wikipedia
Sunday, November 21, 2010
DONATELLO FLORENCEis from
BRUNELLESCHI
worked with
made
is a
Marble StatueMuseo Nazionale del Bargello
is exposed in
DAVID
FROM wikipedia
FROM the museum web site
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note
Note
Note
Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note
Note
Note
Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
A Book
comments on
An artist
reproduced
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note
Note
Note Note
Note
Note
Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
A Book
comments on
An artist
reproduced
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note
Note
Note Note
Note
Note
Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
A Book
comments on
An artist
reproduced
An other Bookis a revision of
is located inA scholar
wrote
Sunday, November 21, 2010
The vision: a collaborative knowledge graph
Note Note
Note
Note
Note Note
Note
Note
Buraq
Prophet Muhammad
Mecca
Buraq.jpg/2134
Buraq.txt/87874
is part ofis part of
mentions
mentions
is related to
A Book
comments on
An artist
reproduced
An other Bookis a revision of
is located inA scholar
wrote
Editorial Policy (peer review?)
Publish on the WebSunday, November 21, 2010
An important consideration
The Semantic Web is not a magic thing
It doesn’t necessarily mean artificial intelligence
It aims at better structuring knowledge so that:
Independently produced knowledge can be more easily merged
Applications can be smarter in collecting, managing and presenting knowledge
Sunday, November 21, 2010
Feb 2008
Sunday, November 21, 2010
Giu 2009
Sunday, November 21, 2010
http://muruca.org
- open source tools for accessing the linked data now- specifically targeted to small-medium communities
Sunday, November 21, 2010
Thank you!
Sunday, November 21, 2010
Muruca
Semantic WebOpen Source Open Access
Sunday, November 21, 2010