Abstract
Along with the rapid growth of the Web Service(WS), how to choose a suitable WS for consumers becomes a hotspot. Nowadays, researchers focus on the selection method based on quality of service (QoS). It does work but need a good model and methods for the selection based on QoS. The work in this paper is based on an extended service model. It puts forward a new model for WS. Based on this service model, service provider can define the attributes for a WS to describe the QoS of the WS. And in the similar matter, service consumer can use these attributes to give an evaluation for the WS. This service model and related methods we designed and implemented are already benefited in a IBM Global SUR (Shared University Resources) project and is running in the real world to collect and catalog the public WS from Internet.
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