Abstract
This article presents an outline of the concept of development of a knowledge base applied to inference systems based on an ontological model and example of appliocation SWRL rule language. Application of ontologies is motivated by a distributed information environment, as well as an input structure of the databases, which prevents reproduction of the data model in the very structure of relations. Ontology also enables the use of an SWRL language in rule base construction, which greatly facilitates further work on the stored data sets.