  The goal is to take a closer look at progress of knowledge engineering in the
field of Semantic Web. Along with theory of Knowledge Representation (KR) and
knowledge processing methods such as Description Logic (DL), reasoning
mechanisms and ontology modelling languages (OWL, RDF, RDFS), the thesis shows
the practical usage of the mentioned approaches in building systems driven by
ontologies. A working prototype of ontology-driven application, written in
Java, has been developed within the scope of this thesis. The system main
assumption is an attempt to integrate database and ontology approach, for
storing and inferring desired information about domain of traffic dangers. For
the needs of the system, domain model of traffic danger concept has been also
designed.
