The URL addressing format allows a user to specify any object in the Internet, along with sufficient information to retrieve it. The WWW server is responsible for mapping a supplied URL into an object or responding with an error message [4]. This procedure leads to the notion that every Internet transaction is divided in two distinct phases:
If these two phases are successfully executed it will be possible to access both to the (now valid) URL and the data. The access to the data will have a particular importance in the present study each time the URL identifies an HTML text file. In such case, from the analysis of its contents results that some parts of the text may be used for the conceptualization of the URL.
The following sections will explain in detail how these two entities - the URL and the data which identifies - provide the information that will be attached to an AO.