Nowadays, the popularity of the Web encourages the development of Hypermedia Systems dedicated to e-learning. However, most of the available Web teaching systems apply the traditional paper-based learning resources presented as html pages, making no use of the new capabilities provided by the Web. There is a challenge to develop educative systems that adapt their instructional content to the style of learning, context, and background of each student. Another research issue concerns the ability to effectively interoperate on the Web reusing learning objects. This work addresses these two...