UDDIe supports the notion of ???blue pages??? to
record user-defined properties associated with a service, and to enable discovery of services
based on these. Searching on other attributes of a Web service are achieved by extending the
Table 2. WSDL description of video Web service within its QoS
262 Serhani, Badidi, & Mohamed-Salem
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businessService class in UDDI with propertyBag, and extending the find method to enable
queries addressed to UDDI to be based on numeric and logical (AND/OR) ranges. UDDIe
can co-exist with the existing UDDI and enables a query to be issued to both simultaneously.
It has been implemented as open-source software. Table 3 describes an example of client
requests to find Web services based on its desired proprieties.
Web Services QoS Discovery
Once the UDDIe registry receives and analyzes a request obtained from a client, it sends a
response to the client. Table 4 provides a scenario for request handling using the UDDIe.
Web Services QoS Negotiation
The QoS negotiation is the process of settling the level of QoS that the client is looking for,
and that the provider is able to deliver.
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