It is the goal of the proposed Web Services Description Language (WSDL) to describe services at a functional level. The Universal Description, Discovery, and Integration (UDDI) schema aims at providing a more business-centric perspective. What has not yet been provided by these proposed standards is the ability to tie together, at the point of offering for a service, these various sources of information in a manner which is both simple to create and use. the WS-Inspection specification addresses this need by defining an XML grammar which facilitates the aggregation of references to different types of service description documents, and then provides a well defined pattern of usage for instances of this grammar. By doing this, the WS-Inspection specification provides a means by which to inspect sites for service offerings.
Source: http://www-128.ibm.com/developerworks/library/specification/ws-wsilspec/
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