To integrate the information locating on the web sites,
service oriented architecture (SOA) should be a foundation,
because it provides a universal access mechanism to all
systems via web services and a universal information
representation via XML. Also, this allows access to data
located beyond a database, such as data produced by am
application, data contained in Deep Web, documents, images,
etc. It is very useful to build an architecture based on SOA to
support the integration and development of information from
structured, transactional systems as well as unstructured,
content-based systems