Evolution of Information Extraction Techniques on the Web
Yang Wenzhu · Journal of Hebei University · 2003
Information extraction techniques on the Web are the current research hotspot. Now many information extraction techniques based on different principle have appeared and have different capabilities. In this paper, we classify the existing information extraction techniques by the principle of information extraction and analyze the methods and principles of semantic information adding, schema defining, rule expression, semantic items locating and object locating in the approaches. Based on the above survey and analysis, several open problems are mentioned.