TOPCRAWL: Community mining in web search engines with emphasize on topical crawling

Web Mining Systems make use of the redundancy of data published on the Web to automatically extract formation from existing web documents. The crawler is an important module of a web search engine. The quality of a crawler directly affects the searching quality of such web search engines. Such a web crawler may interact with millions of hosts over a period of weeks or months, and thus issues of robustness, flexibility, and manageability are of major importance. Given some URLs, the crawler should retrieve the web pages of those URLs, parse the HTML files, add new URLs into its queue and go back to the first phase of this cycle. The crawler also can retrieve some other information from the HTML files as it is parsing them to get the new URLs. This paper proposes a framework and algorithm, TOPCRAWL for mining. The proposed TOPCRAWL algorithm is a new crawling method which emphasis on topic relevancy and outperforms state-of-the-art approaches with respect to recall values achievable within a given period of time. This method also tries to offer the result in community format and it makes use of a new combination of ideas and techniques used to identify and exploit navigational structures of websites, such as hierarchies, lists or maps. This algorithm is simulated with web mining tool Deixto and the basic idea has been implemented using the JAVA and Results are given. Comparisons with existing focused crawling techniques reveal that the new crawling method leads to a significant increase in recall whilst maintaining precision.