Categorizing and extracting information from multilingual HTML documents

The amount of online information written in different natural languages and the number of non-English speaking Internet users have been increasing tremendously during the past decade. In order to provide high-performance access of multilingual information on the Internet, we have developed a data analysis and querying system (DatAQs) that: (i) analyzes, identifies, and categorizes languages used in HTML documents; (ii) extracts information from HTML documents of interest written in different languages; (iii) allows the user to submit queries for retrieving extracted information in the same natural language provided by the query engine of DatAQs using a menu-driven user interface; and (iv) processes the user´s queries (as Boolean expressions) to generate the results. DatAQs extracts information from HTML documents that belong to various data-rich, narrow-in-breadth application domains, such as car ads, house rentals, job ads, stocks, university catalogs, etc. The average F-measure on identifying HTML documents written in a particular natural language correctly is 89%, whereas the F-measure on categorizing HTML documents belonged to the car-ads application domain is 94%.