Web 3.0 Explained - Part II - Techniques by Freek Biljiques

IIWeb 3.0explained with a stamp

(English version)

Part I: the basics

Part II: techniques

A presentation from: Freek Bijl(Dutch) blog: Bijlbrand.nl

Web 3.0 - the semantic web - is about the meaning of data.

This is a stampThis is a stamp

This stamp is from the United KingdomThis stamp is from the United Kingdom

This stamp is designed by John Bryan DunmoreThis stamp is designed by John Bryan Dunmore

In 1980 you could buy this stamp for 1 centIn 1980 you could buy this stamp for 1 cent

Now it’s worth 3 eurosNow it’s worth 3 euros

This stamp is used between 1978 - 1981This stamp is used between 1978 - 1981

The picture on the stamp is a PO BoxThe picture on the stamp is a PO Box

Why do we want to add meaning to

data ?

When a computer understands what data

means, it can do intelligent search,

reasoning and combining.

This makes our live more easy.

The next technologies are used to make a

more semantic web…

RDF XML URI SPARQL XDI XRI SWRL XFN OWL

API OAUTH

!Complicated

An explanation with a stamp collection.

Meaning is about understanding. To

understand we need a language. A language

starts with words.

Things mean something in words. Online, we describe things with

XML.

This is my stamp collection

The first stamp is called “Red dragon” and is from China. It was made in the year: 1984.

The second stamp is called “PO Box” and is from England. It was made in the year: 1992.

< .. etc >

=

<?xml version="1.0" encoding="ISO-8859-1"?>

<collection name=”My stamp collection">

<stamp>

<title>Red dragon</title>

<country>China</country>

<year>1984</year>

</stamp>

<stamp>

<title>PO Box</title>

<country>England</country>

<year>1992</year>

</stamp>

</collection>

We can’t understand words alone. We also need

grammar. Online grammar is RDF (Resource

Description Framework).

This stamp is from England.

This stamp is from England.subject

predicate

object

With RDF Scheme we can define

concepts and make simple relations between them.

This stamp is from England,

hence from Europe.

But, RDF scheme is limited. A language needs more

expression and logic to make good reasoning possible.

That’s why OWL (The Web Ontology Language) was

invented.

Finally, to reason you need rules.

I got this stamp from my uncle.

The rule for calling someone my uncle is that one of my parents has a brother.

mother or fatherIson of brother

Rules are formulated in SWRL (Semantic

Web Rule Language).

<ruleml:imp>

<ruleml:_rlab ruleml:href="#example1"/>

<ruleml:_body>

<swrlx:individualPropertyAtom swrlx:property="hasParent">

<ruleml:var>x1</ruleml:var>

<ruleml:var>x2</ruleml:var>

</swrlx:individualPropertyAtom>

<swrlx:individualPropertyAtom swrlx:property="hasBrother">

<ruleml:var>x2</ruleml:var>

<ruleml:var>x3</ruleml:var>

</swrlx:individualPropertyAtom>

</ruleml:_body>

<ruleml:_head>

<swrlx:individualPropertyAtom swrlx:property="hasUncle">

<ruleml:var>x1</ruleml:var>

<ruleml:var>x3</ruleml:var>

</swrlx:individualPropertyAtom>

</ruleml:_head>

</ruleml:imp>

So,

Words in XMLGrammar in RDF (scheme) and OWLRules in SWRL

There are a lot of things, that can be

described using standard formats.

For example: contact information.

These things are described with microformats.

hCard > contacts

hCalendar > events

hReview > reviews

hResume > resumes

XFN > social networks (relation= a friend or colleague)

Suppose, I want to search for a specific stamp.

“I want all the red stamps, designed in Europe, but

used in the U.S.A., between 1980 and 1990”

We can use SPARQL (Protocol

and RDF Query Language).

Because the web is decentralized and data is in many places, not only language is important.

Exchange of data between different machines is key.

A database with stampsA database with countriesA database with colorsA database with stamp traders

To make a connection a machine needs a source. For this, we use resource identifiers. Best known

resource identifier is the URI (which consists of a name (urn) and a

location (url)).

Because URI’s have international limitations and the need for data-exchange

between machines is rapidly growing there is a successor:

XRI (Extensible Resource Identifier)

There is a standard for sharing, linking and synchronizing data.

This standard is called XDI (XRI Data Interchange).

With all this I am capable of using the

power of all different data resources on the

web.

But…

Data is protected. We need consent and a key to gain acces.

The key to certain data is described in an API (an

application programming interface).

An open standard for accessing (authentication)

the API is OAuth.

So,

RDF XML URI SPARQL XDI XRI SWRL XFN OWL

API OAUTH

… are now words with a meaning for you !

.end

My (Dutch) blog: http://www.bijlbrand.nl

Most important references:

• http://en.wikipedia.org/

• Presentation JeenBroekstra (Wageningen UR)