Web service adopts a service-oriented architecture (services
oriented architecture SOA [3]), as shown in Figure 1. Service
providers are the owners of the services, which provide
platforms for services to access, and services to publish in
service registry center. Service requesters are the enterprises,
organization and individuals that have needs of specific service
functions. Service requesters can discover services and access
the information services binding in the registry center. Service
registry center is a database that can store service description
information; in the registry center, service providers publish
services, services requesters can discover and access binding
information.