The paper describes experiences with GeoNetwork opensource as a possible tool for building metaportal prototype under conditions of the Czech republic environment. The project is developed under project UNSDI that is focused on building geoinformation infrastructure for UN and cooperating organisations. The main part of the paper is focused on CSW 2.0 implementation in the GeoNetwork opensource tool, because We believe that this specification will be the most suitable communication interface. The paper describes system architecture and functionality. At the end of the paper are summarized results of system testing.