For the last few decades data integration has been one of the most actual problems of computer science. With the development of IT industry countless data sources emerged in the Internet. These data sources are heterogeneous in all possible ways. Effective usage of such data sources is impossible without automatical tools for data search, retrieval, publishing and transformation. This paper describes research-in-progress work on data integration system in linked open data space. Proposed system uses concept of RDF (Resource Description Framework) identity links to interlink heterogeneous local data sources and integrate them into global data space.