2 A Semantic Location Service for Pervasive Grids

paradigms have emerged and rapidly affirmed. These two worlds, however, can no longer be separated islands. As a matter of fact, traditional grids are moving towards Pervasive Grid environments and, as a result, they benefit from both grid and mobile technologies. In particular, a key feature of the Pervasive Computing paradigm, like the location-awareness, can be used to enhance the QoS of existing Grid services, that is Pervasive Grids should customize services access depending on mobile objects locations. But, in these environments, such as in the Pervasive environments, different types of positioning systems can be used to determine mobile objects locations and each of them produces location information with a specific format and granularity. This paper presents a location service that locates active mobile objects