With the development of the Internet, the Web has become invaluable information source. In order to use this information for more than human browsing, web pages in HTML must be converted into a format meaningful to software programs. Wrappers have been a useful technique to convert HTML documents into semantically meaningful XML files. In this paper, we propose a data extraction approach based on extracting schema, which generates automatically a wrapper to extract data from an HTML document, and produces an XML document conforming to given DTD. After the user defines extraction data schema in the form of DTD, the wrapper is generated automatically with the induction and leaning algorithm. The experiment indicates that the approach can correctly extract the required data from the source document with high accuracy.
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