Issues of semantic interoperability and service integration for e-government portals are the domain of
interest of the present paper. We propose a Conceptual Model for One-Stop e-Government Portals based on the
Semantic Web Service technology. We describe our research into building the three basic ontologies and their
integration with standard ontologies. The result is a project-independent reusable model. At the same time, we
outline a simple methodology for applying the proposed conceptual model into a specific scenario.
