| http://www.w3.org/ns/prov#value | - Here is the explanation: the first site contains a form, where you put in details such as departure- & arrival dates, airports etc., then you click submit and you will come to a second page (bookingsite) where you see all planes flying on the specific dates to your selected airport. on this second page you need to select a specific flight (now this selection happens in another form, in this case the
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