  The field of information extraction from the Web emerged with the growth of
the Web and the multiplication of online data sources. This paper is an
analysis of information extraction methods. It presents a service oriented
approach for web information extraction considering both web data management
and extraction services. Then we propose an SOA based architecture to enhance
flexibility and on-the-fly modification of web extraction services. An
implementation of the proposed architecture is proposed on the middleware level
of Java Enterprise Edition (JEE) servers.
