Semantic Web - Introduction

What is the Semantic Web? www.pleso.net for Codecamp 2009 Kyiv, Ukraine 2009-01-15, Amsterdam, The Netherlands Ivan Herman, W3C ReadWriteWeb Microformats

Let’s organize a trip to Budapest using the Web!

You try to find a proper flight with …

… a big, reputable airline, or …

… the airline of the target country, or …

You have to find a hotel, so you look for…

… a really cheap accommodation, or …

… or a really luxurious one, or …

oops, that is no good, the page is in Hungarian that almost nobody understands, but…

Of course, you could decide to trust a specialized site…

You may want to know something about Budapest; look for some photographs…

but you can also look at a (social) travel site

What happened here? ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

Another example: social sites. I have a list of “friends” by…

… and, of course, the ubiquitous Facebook

[object Object],[object Object]

What would we like to have? ,[object Object],[object Object],[object Object],[object Object]

But wait! Isn’t what mashup sites are already doing?

[object Object],[object Object],[object Object],[object Object],[object Object]

Let us put it together ,[object Object],[object Object],[object Object],[object Object],[object Object]

So What is the Semantic Web?

It is a collection of standard technologies to realize a Web of Data WWW -> GGG (Giant Global Graph)

Towards a Semantic Web ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Towards a Semantic Web ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

However… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: automatic airline reservation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is needed? ,[object Object],[object Object],[object Object],[object Object],[object Object]

The rough structure of data integration ,[object Object],[object Object],[object Object],[object Object],[object Object]

A simplified bookstore data (dataset “A”)

1 st : export your data as a set of relations

Some notes on the exporting the data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Another bookstore data (dataset “F”)

2 nd : export your second set of data

3 rd : start merging your data

3 rd : start merging your data (cont.)

3 rd : merge identical resources

Start making queries… ,[object Object],[object Object],[object Object],[object Object]

However, more can be achieved… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3 rd revisited: use the extra knowledge

Start making richer queries! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Combine with different datasets ,[object Object],[object Object]

It could become even more powerful ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simple SPARQL example SELECT ?isbn ?price ?currency # note: not ?x! WHERE {?isbn a:price ?x. ?x rdf:value ?price. ?x p:currency ?currency.}

Simple SPARQL example ,[object Object],SELECT ?isbn ?price ?currency # note: not ?x! WHERE {?isbn a:price ?x. ?x rdf:value ?price. ?x p:currency ?currency.}

Pattern constraints SELECT ?isbn ?price ?currency # note: not ?x! WHERE { ?isbn a:price ?x. ?x rdf:value ?price. ?x p:currency ?currency. FILTER(?currency == € } ,[object Object]

The network effect ,[object Object],[object Object],[object Object]

Semantic Web technologies stack

Yahoo’s SearchMonkey ,[object Object],[object Object]

Linking Open Data Project ,[object Object],[object Object],[object Object]

DBpedia: Extracting structured data from Wikipedia http://en.wikipedia.org/wiki/ Kolkata <http://dbpedia.org/resource/ Kolkata > dbpedia:native_name “Kolkata (Calcutta)”@en; dbpedia:altitude “9”; dbpedia:populationTotal “4580544”; dbpedia:population_metro “14681589”; geo:lat “22.56970024108887”^^xsd:float; ...

Automatic links among open datasets DBpedia Geonames Processors can switch automatically from one to the other… <http://dbpedia.org/resource/ Kolkata > owl:sameAs <http://sws.geonames.org/1275004/>; ... <http://sws.geonames.org/1275004/> owl:sameAs <http://DBpedia.org/resource/Kolkata> wgs84_pos:lat “22.5697222”; wgs84_pos:long “88.3697222”; sws:population “4631392” ...

Faviki: social bookmarking with Wiki tagging ,[object Object],[object Object]

Lots of Tools ( not an exhaustive list!) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Application patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Microformats currently supported ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Microformats coming in the not-so-distant future ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Microformats coming in the not-so-distant future (contd) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Semantic Web ,[object Object],[object Object],[object Object],[object Object],[object Object],Image credit: dullhunk ,[object Object],[object Object],[object Object],[object Object]

Semantic Apps ,[object Object],[object Object],[object Object],[object Object],Example: Calais Reuters, the international business and financial news giant, launched an API called Open Calais in Feb 08. The API does a semantic markup on unstructured HTML documents - recognizing people, places, companies, and events. Ref: Reuters Wants The World To Be Tagged ; Alex Iskold, ReadWriteWeb, Feb 08

Top 10 Semantic Web Products of 2008 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Top 10 Semantic Web Products of 2008 ,[object Object],[object Object],[object Object],[object Object]

Thanks! http://www.pleso.net/ [email_address] Credits: * 2009-01-15, What is the Semantic Web? (in 15 minutes), Ivan Herman, ISOC New Years Reception in Amsterdam, the Netherlands * 2008-09-24, Introduction to the Semantic Web (tutorial) Ivan Herman, 2nd European Semantic Technology Conference in Vienna, Austria * ReadWriteWeb - Web Technology Trends for 2008 and Beyond (http://www.readwriteweb.com/), 10 best semantic applications * Microformats (http://microformats.org/)

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