??? This is one of the important strengths of agent-based
system design, pointed to in Jennings, 2001 and Wooldridge, 2002.
As mentioned, the content storage is the Jena repository, which was designed to
persist RDF triples (RDF is our semantic demarcation approach of choice). The
content management subsystem encompasses a number of agents (considered
jointly as a data management agent [DMA]) that work to assure that users of the
system have access to the best quality of data. These agents, among others deal
Ganzha, Gawinecki, Paprzycki, G?…siorowski, Pisarek, and Hyska
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with: time sensitive information (such as changes of programs of movie theaters),
incomplete data tokens, or inconsistent information (Angryk et al., 2002; Gordon
& Paprzycki, 2005).
Content delivery subsystem has two roles. First it is responsible for the format (and
syntax) of interactions between users and the system. However, this aspect of the
system, as well as agents responsible for it, is mostly outside of scope of this chapter
(more details can be found in Galant et al.
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