  Representing knowledge with the use of ontology description languages offers
several advantages arising from knowledge reusability, possibilities of
carrying out reasoning processes and the use of existing concepts of knowledge
integration. In this work we are going to present an environment for the
integration of knowledge expressed in such a way. Guaranteeing knowledge
integration is an important element during the development of the Semantic Web.
Thanks to this, it is possible to obtain access to services which offer
knowledge contained in various distributed databases associated with
semantically described web portals. We will present the advantages of the
multi-agent approach while solving this problem. Then, we will describe an
example of its application in systems supporting company management knowledge
in the process of constructing supply-chains.
