In recent years, the number of e-tourists has signicantly
increased in response to the increasing availability of on-line
tourism information. Planning a tour on-line requires detailed
information about several aspects of tourist attractions, such
as the activities provided, their open hours, admission fees,
and the routes between them. A single tourism web site
seldom provides all needed information, while different web
sites may provide diverse and often conicting information
about the same attraction. For a given piece of information,
such as admission fees, it may be presented in various
expressions, typically `cost', `admission price', and `entry
price', as well as the term `admission fees' itself. For an effec-
tive tour plan, the semantically heterogeneous information
needs to be integrated and uniformly represented, otherwise
tour planning on-line is often seen a tedious and frustrating
experience [30].