Prefiltering Strategy to Improve Performance of Semantic Web Service Discovery

Listing 4

Part of goal instance specification dealing with the capability desired and the category of the desired service.

Goal Instance

“Book a flight from Berlin to Istanbul”

hasCategory → AirTransportation,

requestsCapability → goal_1

     hasPrecondition→

        reqFlight

          originateCity → berlin,

          terminalCity → istanbul,

          departureDate → ?DDate,

          returnDate → ?RDate,

          numberPeople → 2

               :RequestTicket

          ,

     hasPostcondition→

        (?BookTicket

          departureDate → ?DDate,

          returnDate → ?RDate

          fromAirport → ?FromAirport,

          toAirport → ?ToAirport,

          cost → ?TotalCost

              ]:Response

          ,

         is_equal(?ToAirport, Sabiha_Gokcen),

         less(?TotalCost, 500)

        ),

     optimization→

        optObj[optCost → ?TotalCost]

              ]