Suppose that the semantic web system was built to administer selling and buying of the used cars over an Internet. A system would contain the two main applications:

Let us call an Internet applications for the IBA (I Buy Application), and the ISA(I Sell Application).

People who want to buy the car could use the IBA application which would look like this:

In "real life" application you would have been asked to identify yourself first time you used it. Your ID would be stored in the RDF file. Your ID would then identify you as the person with the name, address, email, and the social security number.

When you submitted the query, the application would return a list of cars which are for sale, and this list could be drilled down and sorted by the year, price, location and the availability. This information would be returned from the web spider continuously searching a web for the RDF files.

People those who want to sell the car could use the ISA application similar to the one shown below:

When we submitted a form, the application would ask us for more information and store the ID and information in the RDF file made available to a web. An RDF file would contain the information like:
ID: Name, address, email, security number. Selling Item: type, model, picture, price, description.