Survey of knowledge extraction technologies
知识抽取技术综述*

Knowledge extraction, whose main task is to extract the factual knowledge from the no-semantics-embedded documents and to realize the full and effective use of Web data, has become a hot topic in the semantic Web field. Firstly, this paper gave a brief introduction of knowledge extraction related technologies. Secondly, analyzed and compared the English-oriented and Chinese-oriented knowledge extraction methods systematically, especially the methods towards Chinese natural language documents. Lastly, pointed out the main drawbacks of the current methods and discussed the future development direction of knowledge extraction.