We shall continue to use negotiation as an example to illustrate how ontologies and semantics help in MAS. Besides helping the agent to understand concepts, ontologies and semantics also help humans to understand their requirements and therefore help the specification of requirements and preferences better.
For example, in Yahoo auction, can you easily find a digital camera with the requirement of "better than 3 megapixals" and "fitting CF or SD card"? With ontologies, we can.
After the motivating example, we shall then go over some technical details of RDF and OWL, with nowadays are essential for many other "intelligent" or searching applications, not just for agents.
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