Semantic Web Tutorial
 |
The word semantic stands for the meaning of.
The semantic of something is the meaning of something.
The Semantic Web = a Web with a meaning.
|
What is the Semantic Web?
The Semantic Web is a web that is able to describe things in a way that computers can understand.
- The Beatles was a popular band from Liverpool.
- John Lennon was a member of the Beatles.
- "Hey Jude" was recorded by the Beatles.
Sentences like the ones above can be understood by people. But how can they be
understood by computers?
Statements are built with syntax rules. The syntax of a language defines the
rules for building the language statements. But how can syntax become semantic?
This is what the Semantic Web is all about. Describing things in a way that
computers applications can understand it.
The Semantic Web is not about links between web pages.
The Semantic Web
describes the relationships between things (like A is a part of B and Y is a member of
Z) and the properties of things (like size, weight, age, and price)
 |
"If HTML and the Web made all the online documents look like
one huge book, RDF, schema, and inference
languages will make all the data in the world look like one
huge database"
Tim Berners-Lee, Weaving the Web, 1999
|
The Resource Description Framework
The RDF (Resource Description Framework) is a language for describing
information and resources on the web.
Putting information into RDF files, makes it possible for computer programs
("web spiders") to search, discover, pick up, collect, analyze and process information from the web.
The Semantic Web uses RDF to describe web resources.
If you want to learn more about RDF, please read our
RDF tutorial.
How can it be used?
If information about music, cars, tickets, etc. were stored in RDF files,
intelligent web applications could collect information from many different
sources, combine information, and present it to
users in a meaningful way.
Information like this:
- Car prices from different resellers
- Information about medicines
- Plane schedules
- Spare parts for the industry
- Information about books (price, pages, editor, year)
- Dates of events
- Computer updates
Can it be understood?
The Semantic Web is not a very fast growing technology.
One of the reasons for that is the learning curve. RDF was developed by
people with academic background in
logic and artificial intelligence. For traditional developers it is not very
easy to understand.
One fast growing language for building semantic web applications is RSS. If
you want to learn more about RSS, please read our RSS tutorial.
In the following pages of this tutorial we will concentrate on using RDF to
discover the potentials of the semantic web.
Please move on to the next chapter to see a simple semantic web application.
Reliable, Affordable, Feature-Rich Web Hosting!
Take the uncertainty out of Web hosting and let
GoDaddy.com put service, performance and value back in. No matter which
hosting type or plan you choose, your site receives 24/7
maintenance and protection in our world-class data center. Plus,
you get the expert, friendly service you deserve, from the
world's largest hostname provider.
With three plans to choose from and
prices starting at just $4.99 per month, GoDaddy.com is sure to have a plan that's
right-sized and right-priced just for you!
All plans feature FREE 24x7 setup, FREE 24x7 monitoring, best-
of-breed routers, firewalls and servers, 24x7 onsite physical security
and access to our exclusive Go Daddy Hosting Connection, THE place
to install over 30 FREE applications. Virtual Dedicated and Dedicated
Server plans also available.
Visit GoDaddy.com today.
Virtual Dedicated, Dedicated Server and unlimited plans also available.
Save 20% on 12 months or more of shared web hosting - Enter code w3s20off at checkout
| 
