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The Research of Data Extraction and Semantic Annotation in Deep Web

Author: WeiYongGang
Tutor: YuanFang
School: Hebei University
Course: Applied Computer Technology
Keywords: Deep Web Data Extraction Semantic annotation
CLC: TP393.09
Type: Master's thesis
Year: 2009
Downloads: 64
Quote: 1
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Abstract


With the rapid development of computer and network technology , the Internet plays an increasingly important role in people's daily lives . Information retrieval as an important part of Internet applications , the user access to information . At present , information retrieval is generally completed through a search engine . For technical reasons, the traditional search engine can only be found in the static web content , and can not obtain the information in the Web database . How to take full advantage of the rich resources of the Web database , a problem worthy of study . Stored in the Web database , you can not hyperlink access to a collection of resources is called Deep Web . Automatically obtain the Deep Web behind many Web database of resources , the need to establish the Deep Web data integration system , results processing module of the system is divided into data extraction and semantic annotation of two parts . Data extraction through technical means to extract data on the Web page , save it as an XML document or relational schema as a basis for further processing . Semantic annotation is to add semantic annotations extracted data , facilitate computer recognition and treatment , which has a higher use value . This article uses the XPath technology to complete the Deep Web data extraction and propose a semantic annotation method based on the Chinese part of speech and knowledge in the field . Xpath - based data extraction method first standardization of Deep Web query results page in XML format , and then determined in the process of traversing the XML document to be extracted data path expression , the final completion of the expression data extraction and save it as an XML format . Semantic annotation to increase semantic information to extract the data . The described herein semantic annotation With Chinese word segmentation tool to extract a result of speech, and in accordance with the combination of parts of speech or part of speech and semantic mapping rules , combined with domain knowledge semantic annotation . The experiments show that the methods described herein to be accurate extraction of the Deep Web query results and extract the results of semantic annotation , which verifies the validity of the method .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > The application of computer network
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