What really means web 3.0, or: the semantic web? With this second presentation I explain the meaning of web 3.0 by an example of a stamp collection. This presentation is a translation of a Dutch version made earlier. For more detailed information in Dutch you can have a look at BijlBrand.nl
Web 3.0 explained with a stamp (pt II: techniques)
Web 3.0 explained with a stamp (English version) Part I: the basics Part II: techniques II
A presentation from: Freek Bijl (Dutch) blog: Bijlbrand.nl
Web 3.0 - the semantic web - is about the meaning of data.
This is a stamp This stamp is from the United Kingdom This stamp is designed by John Bryan Dunmore In 1980 you could buy this stamp for 1 cent Now it’s worth 3 euros This stamp is used between 1978 - 1981 The picture on the stamp is a PO Box
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.
<ul><li>This is my stamp collection </li></ul><ul><li>The first stamp is called “Red dragon” and is from China. It was made in the year: 1984. </li></ul><ul><li>The second stamp is called “PO Box” and is from England. It was made in the year: 1992. </li></ul><ul><li>< .. etc > </li></ul>
These things are described with microformats. <ul><li>hCard > contacts </li></ul><ul><li>hCalendar > events </li></ul><ul><li>hReview > reviews </li></ul><ul><li>hResume > resumes </li></ul><ul><li>XFN > social networks (relation= a friend or colleague) </li></ul>
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 stamps A database with countries A database with colors A 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.