Develop Of Component Property Data Gather And Public System Based On Search Engine And XML

After years building of component property database, there are many sites which provide query service for users form chemical Industry .But they usually can't offer comprehensive component property data, and the data format are also not uniform .The existent search engines are Web pages gathering and full-text search systems based on internet links analysis .Now, the top-specific search engine relevant to a set of topics is beginning to research how to get more data.In this paper we introduce the history, work principle, new technology, challenges of search engine and the top-specific search engine , propose the Web page analysis, data extracting and the Web page active retrieval. A component property data gather and public system is built with Java and Oracle 9i, used Spider and Web page analysis to get data, used XML to transform and organize data to insert into local database. A Web data extraction method is proposed to get exact data,...