During this process the PIA performs
the Preparing MRS function. Let us now discuss in some detail agents and their
interactions. Before we proceed let us note that we omit a special situation when
the system is initialized for the very first time and does not have any data stored in
the Jena repository. While this situation requires agents started in a specific order,
since it is only a one-time event it is not worthy of extra attention. We therefore as-
Ut l z ng Semant c Web and Software Agents n a Travel Support System
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sume that there is already data stored in the system and focus on interactions taking
place in a working system.
The WA interfaces with Web sites, mapping XML- or HTML-demarcated data
into RDF triples describing travel objects (according to the ontology used in our
system [Gawinecki, Gordon, Nguyen, Paprzycki, & Szymczak, 2005; Gawinecki,
Gordon, & Paprzycki, et al., 2005; Gordon, Kowalski, et al., 2005]).
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