Customization is
provided for the service requesters to describe their preferences for discovery. In
each enterprise domain, the requesters??™ QoS feedback is collected and summarized
in a local UX server. By sharing these experiences from all requesters in the local
domain, the system predicts the service??™s future performance according to the service??™s
historical performance. To support the discovery between different cooperation
domains, we design a general federated service and then enable the UX system??™s
federated discovery ability based on this federated service. The system handles the
federated inquiry and provides a simple view over the whole federation. This work
gives a pluggable extension for UDDI to provide the QoS-aware service discovery.
The problem for cross-domain service discovery is also addressed. However, this
system does not have a straightforward way to extend and share new metrics definitions
between service partners. This leads to our research for the formal definition
of QoS metrics using ontologies.
WS-QoS (Tian, Gramm, Ritter, & Schiller, 2004) defines the XML schema for Web
services to describe their services??™ high and low level QoS properties.
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