1. National Science Library, Chinese Academy of Sciences, Beijing 100190,China;
2. Computer Network Information Center, Chinese Academy of Sciences, Beijing 100190,China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049,China
Semantic linking of multi genre, multi typed, autonomous, and distributed data is always in the center of knowledge organization and discovery, and the concept of linked data provides a light-weight, incremental, scalable and extensible mechanism. Based on systemanic review of the field, the paper describes the four rules and the basic technical framework of linked data, presents the key techniques enabling linked data publishing, linking parsing and browsing, linked data search engines,link update and maintenace. A few typical applications are given and key challenges in applying linked data in a practical domain are also explored.
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