Data integration for the unified web-based information platform of heterogeneous e-Govemment system becomes the most important issue in eGovernment system conformation. This paper proposes a new model of data integration based on in-depth analysis of Topic Map technology and Relational Database Management System (RDBMS). This model uses OAI protocol for Metadata harvesting to automatically generate a topic index layer between the application layer and data layer of e-Government systems. To integrate the intercity heterogeneous e-Govemment systems, we derive topic maps in the topic index layer ...
