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This paper deals with a problem of describing role-playing games in a computer readable format, such as an ontology. Ontology as a model represents a union of gaming, knowledge and artificial intelligence aproaches, and is therefore interesting to research as a description of a domain included in the modern market of role-playing games (and especially massive multiplayer online role-playing games) that have a rich turnover and numerous players available, which makes them a suitable domain to be researched. In this paper an onotology used for describing MMORPGs is presented and discussed along with suggested possible future research.