【正文】 onstraints and the systems, bining contentbased filtering technologies, interactive query management, and variations of the collaborativefiltering approach or casebased reasoning, rank suggestions extracted from structured catalogues. Tourism remendation poses peculiar requirements that are related to the plexity and to the intangibility of the travel product. Remendations must refer to a variety of products (locations, attraction, acmodation, flights, etc.) in order to provide a meaningful picture of the proposed travel. 5. Semantic Web. The semantic web vision, ., the idea of having data on the Web defined and linked in a way that it can be used by machines also for automation, integration and reuse across various applications, provides a unifying view over the above mentioned technologies. In tourism this technology may have a major impact (see, for example, the European project [3]). The industry provides a challenging test bed for peertopeer semantic Web services, based on the integration of the Semantic Web with peertopeer Web services. For instance, services for finding or integrating information providers eventually needs to directly exploit resources present at other nodes without intervention of any central server, where nodes may join and be integrated in an ad hoc manner [7]. 6. Mobility. Travelers expect to get access to services and information from various devices, whenever and wherever they need it. Typical mobile applications can be found in the following areas: airlines, hotels and restaurants, transportation, city guides, traffic and weather conditions, other services like translations or currencies conversion. Mobile terminals open up new and enhanced ways to support tourists while on tour. While the new technologies promise benefits and added value, they also raise challenges concerning usability, accessibility over different devices, trustworthiness and interactivity. The challenge is a context sensitive, personalized and effective model of interaction that take into account the constraints of ubiquitous access. But here sophisticated user models developed in the tourism domain as remendation systems described previously may help to pass these obstacles. 4 ConclusionsTravel and tourism has shown how emerce may change the structure of an industry and the way business is done, and where such a process creates also new business opportunities. The deployment of more specialized services, flexible network configurations and further consumer integration will lead to smart market places, integrating all stakeholders. 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