Who is the current user of maps? It is not possible to give an unambiguous answer. But the important group of users could be defined as ?people being able to create and distribute their own maps via web technologies, but they have not any cartographic education and knowledge?. Such users (or map makers) can create for instance choropleth maps or cartograms, but they do not know anything about these cartographic methods. They do not see restriction of methods, their advantages, signification or limits of usage. The opportunity of cartographers consist in a cooperation on development of a solution supporting automatic providing of cartographic information and knowledge. Such agents are known as expert systems. On our poster we do not want to describe a complete expert system but only ontology as its fundamental part focused on a sharing of semantic information and knowledge. Ontologies and ?reasoning? process should be the very important part of common cartographic expert system.