The OGC WMS operation process for mapping application
is illustrated in Figure 2. The WMS GIS Web Service provides
simple operational interface which can directly mapping to the
Web service for operation. The client application requests the
information from the web map server. The map server retrieves
from the database the appropriate layers of geo-feature data for
the specified spatial domain and generates a map that can be
viewed directly in a graphical web browser or other pictorial
software. All the business logic can be achieved by the exterior
layer that data access layer can be directly connected to the
customer applications.