g., if the
user is asking for a Korean restaurant then other Oriental restaurants are likely to
be included). The PIA subagents operate as a team passing the result set from one
to the next (in our current implementation they are organized in a ring), and since
their role is to maximize the set of responses to be delivered to the user no potential
response is removed from the set. Final result of their operation is the MRS that is
operated on by the PA. Action diagram of the PIA is depicted in Figure 6.
A separate PA will be created for each user and will play two roles in the content
delivery subsystem. First, it is the central coordinator??”for each user query it directs
it from one agent to the next, constantly monitoring processing progress. Second, it
Figure 6. Action diagram of the PIA
Ut l z ng Semant c Web and Software Agents n a Travel Support System
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utilizes user profile to filter and order responses that are to be sent to the user.
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