According to Webster's Online Dictionary semantic means "the relationships between symbols and what they represent." Tim Berners-Lee, the man who invented the World Wide Web in 1989 at CERN, the European Particle Physics Laboratory in Geneva, has used the term to christen the Internet of the future.

The Semantic Web is a set of technologies he's developing right now as director of the World Wide Web Consortium, in Cambridge, Massachusetts. Born in London in 1955, Berners-Lee was knighted by Queen Elizabeth II in 2004. In this exclusive interview, he explains his vision of the future Semantic Web, which he says will be much more powerful than anything we have seen before.

IDG: My first question is the most obvious one: Can you explain in simple terms what the Semantic Web is?

Berners-Lee: I have often been asked about that. And the simple thing to point out is: in your computer you have your files, your documents that you can read, and there are data files which are used in applications, data files like calendars, bank systems, spreadsheets. These contain data which is used in documents that are out of the Web. They can't be put on the Web.

So, for example, if you are looking at a Web page, you find a talk that you want to take, an event that you want to go to. The event has a place and has a time and it has some people associated with it. But you have to read the Web page and separately open your calendar to put the information on it. And if you want to find the page on the Web you have to type the address again until the page turns back. If you want the corporate details about people, you have to cut and paste the information from a Web page into your address book, because your address book file and your original data files are not integrated together. And they are not integrated with the data on the Web. So the Semantic Web is about data integration.

When you use an application, you should be able to put data there so that you could configure that data. I should be able to inform my computer: "I'm going to that event." And when I say that, the machine will understand the data. The Semantic Web is about putting data files on the Web. It's not just a Web of documents but also of data. The Semantic Web of data would have many applications to connect together. For the first time there is a common data format for all applications, for databases and Web pages.

IDG: Did you come up with the term "Semantic Web?" Is this the so-called Web 3.0? What's the difference between the Webs 2.0 and 3.0?

Berners-Lee: Yes, I did. It was in 1999, in my book "Weaving the Web." Web 2.0 is a name to describe how the files using the Web work. You have user-generated content, and you have people logging on Web sites and tagging things,

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