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Travel and tourism represents the leading application in b2c e-commerce, due to several reasons: tourism is an information business, it has a rather a long value chain, and since the 60s it represents a classical field of IT and network applications (i.e., computerized reservation systems / global distribution systems — CRS/GDS). Thus, this sector depends heavily on advanced Information Technologies solutions, and the characteristics of this marketplace lead to a crucial challenge: the strong need for interoperability between different information systems, allowing the flow of information in this complex value process. Data heterogeneity is a well known problem, and the existing practical approach to solve this problem is to write ad-hoc data interface programs for each pair of communicating systems. Experience shows that development and maintenance of these programs are expensive in terms of both time …