Timea Turdean15/03/2015

History of the Web

History of the Web

Web of Documents

Web of Data

"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."

Sir Tim Berners-Lee

Semantic Web Why do we need semantic web?

Why is our current web not enough?

How do I find the right information?What is important, what is not?

Is the information I got complete?Can the search be reliable?

Can I really trust the information I found?

Semantic Web The smallest unit of the Semantic Web is a TRIPLE

Java IslandIS AN

<SUBJECT PREDICATE OBJECT>

<http://dbpedia.org/resource/Java> <http://example.org/isAn>

<http://dbpedia.org/resource/Island>

<?s ?p ?o>

Principles of Semantic Web 1. Each resource has a Unique Resource Identifier (URI)

Java

Java

http://dbpedia.org/resource/Java

http://dbpedia.org/resource/Java_(programming_language)

Principles of Semantic Web 2. We use resources and not just strings. In this way a resource

can belong to certain classes. Classes can have properties

sameAs sameA

s

http://ja.dbpedia.org/resource/ジャワ島

http://it.dbpedia.org/resource/Giava

http://dbpedia.org/resource/Java

Principles of Semantic Web 3. Classes, properties and resources are described through the

Resource Decription Framework (RDF)<http://dbpedia.org/resource/Java>

<http://example.org/isAn> <http://dbpedia.org/resource/Island>

<http://dbpedia.org/resource/Java> <http://dbpedia.org/resource/sameAs>

< http://ja.dbpedia.org/resource/ジャワ島><http://dbpedia.org/resource/Java>

<http://dbpedia.org/resource/sameAs> <http://it.dbpedia.org/resource/Giava>

Principles of Semantic Web 4. Classes are represented in Schemas and Ontologies

Principles of Semantic Web 4. Classes are represented in Schemas and Ontologies

<?xml version="1.0"?>

<rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"xml:base="http://dbpedia.org/resource/Thing#">

<rdf:Description rdf:ID="Island"> <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/></rdf:Description>

<rdf:Description rdf:ID="Java"> <rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/> <rdfs:subClassOf rdf:resource="#Island"/></rdf:Description>

</rdf:RDF>

Principles of Semantic Web 5. Information about a resource is distributed on the Semantic

Web and can be used/linked through Linked Data

Linked Open Data

Linked Open Data in 2014

SPARQLWhat are the countries and their capitals in Africa?

How to publish & link data?

Publish data● Put the raw data online● Organize it, so it can be found● Liscence it, so it can be reused

Make Web data accessible● Metadata inside webpages● Use standard open formats● Add a Web API (SPARQL endpoint)

Integrate with the Web● Identify things <http://dbpedia.org/resource/Java>● Link them together● Use RDF to publish data & models

Examples● Semantic search - Reegle.info

● A music repository and mashup – BBC.co.uk/music

● Google uses Knowledge Graphs – Google.com

"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."

Sir Tim Berners-Lee

SummaryNow I got it...

Read more...● History of web - http://webfoundation.org/about/vision/history-of-the-web/● Getting started with Semantic Web: http://semanticweb.org/wiki/Getting_started● Basics of Semantic Web on W3C - http://www.w3.org/2001/sw/wiki/Main_Page● Questions on semantic web - http://answers.semanticweb.com/● Other presentation -

https://www.slideshare.net/search/slideshow?searchfrom=header&q=semantic+web

References● History of Web - http://blog.learnlets.com/?cat=10● WorlsWideWeb browser -

http://www.w3.org/People/Berners-Lee/WorldWideWeb.html● Principles of Semantic Web – www.blog.semantic-web.at● Semantic Web schema - http://wiki.infowiss.net/Semantic_Web● LOD - http://data.dws.informatik.uni-mannheim.de/lodcloud/2014/ISWC-RDB/● SPARQL - http://en.wikipedia.org/wiki/SPARQL● How to publish your data -

http://www.slideshare.net/ldodds/web-integrated-data● The answer to life univers and everything -

http://www.desktopwallpapers4.me/typography/is-the-answer-to-everything-15318/● Clean energy - http://www.reegle.info/● BBC music - BBC.co.uk/music ● Google knowledge graph -

http://www.google.com/insidesearch/features/search/knowledge.html

What is the conclusion?The Semantic Web is growing

andlinked open data

is the future

Thank you for your attention

Timea Turdean15/03/2015