“The Semantic Web is not a separate Web, but an extension of the current one. In it, information is given with a well-defined meaning, allowing better interaction between computers and people.” With these words, Berners-Lee (2001) defines the plans of his working group at the World Wide Web Consortium* (W3C) to operate the transformation that will modify the Web as we know it today. “Semantic Web” (Decker et al., 2000 & Berners-Lee et al., 1999) is the generic name for this project, spearheaded by the W3C, which aims to embed intelligence and context in the XML codes used to create web pages, in order to improve how programs can interact with these pages and also enable more intuitive use by users.