This document discusses the concepts of linked data and the semantic web. It explains that linked data involves publishing structured data on the web in a way that allows machines to naturally understand and process it by linking data about things rather than just documents. This creates a web of data that is globally interconnected through URIs and RDF standards. Linked data is key to achieving the goal of the semantic web, which is a web of data that can be processed directly by machines.

1. Linked Data : and so what?

2. semantics is the study of meaning, as inherent
at the levels of words, phrases, sentences
http://en.wikipedia.org/wiki/Semantics

3. the Semantic Web is a web of data..
like a global database
http://www.w3.org/DesignIssues/Semantic.html

4. first step is putting data on the Web in a form that
machines can naturally understand...
This creates what I call Semantic Web -
a web of data that can naturally processed
directly or indirectly by machines
Sir Tim Berners-Lee, Weaving the Web, Harper San Francisco,1999

5. The term Linked Data refers to a set of best practices
for publishing and connecting strucutured data on the Web.
The Semantic Web is the goal or end result...
Linked Data provides the means to reach that goal.
from Linked Data: The Story So Far, Sir T. Berners-Lee 2009

6. Web of Linked Data
- designed for machine first
- primarily links data about Things, not documents
- is for humans in the end

7. Haven’t we been putting data on the web?
Yes, in CSV, relational database, XML...
But these approaches are not so easy to integrate!
And mapping is no solution for a distribuited Web of Data
Actually it is about
a data (RDF)
and a naming (URI) model on the Web

8. Linked data applications operate on top of
unbound, global data space.

9. What’s happening?

15. Technically...

16. Linked Data is a way of publishing data on
the Web that:
- encourages reuse
- reduces redundancy
- maximises inter-connectdness
- enables network effects

17. So, how is this achieved?

18. - Use URIs as names for things
- Use HTTP URIs so that everyone can look up those
names
- Provide useful information, by a URI, using standards RDF,
SPARQL
- Include links to other URIs discovering more things

19. Publishing Linked Data
- RDFizers convert data format into RDF
- D2R Server creates linked data from relational
databases
- Sparq extracts linked data

20. Linked Data Browsers
navigate between data sources
- Marbles
- Tabulator
- Disco

21. - merges data about the same things from different sources
- follows specific predicates found in retrived data such as owl:sameAs and rdfs:seeAlso in order to gain
more information about a resource and to obtain human-friendly resource labels
http://marbles.sourceforge.net/

22. Linked Data Search Engines
- for Apps: Sindice, Swoogle
- for humans: Falcons, SWSE

23. provides API that other linked data apps can use
http://sindice.com/

24. The Semantic Web isn't just about putting data on the
web. It is about making links, so that a person or machine
can explore the web of data.
With linked data, when you have some of it, you can find
other, related, data....

25. If someone has the URI of that thing, what relationships to what other objects is it useful
to know about?
Linked data is essential to actually connect the semantic web. It is quite easy to do with a
little thought, and becomes second nature.
Various common sense considerations determine when to make a link and when not to.
Tim Berners-Lee
Date: 2006-07-27, last change: $Date: 2009/06/18 18:24:33 $
Status: personal view only. Editing status: imperfect but published
http://www.w3.org/DesignIssues/LinkedData.html

26. thanks!
http://titticimmino.com
tc@titticimmino.com