How UDDI and WSDL will actually be implemented still has yet to be seen. The two end points in taking advantage of a web service. DNS is at the heart of location. Finding the correct node to address within a domain for a particular service is what DNS was built for. However, DNS has not been extended to support richer form of location other than matching a name with an IP address and vice versa.
Integration is an entirely different issue.
Integration is all about the data and what it means. Common data typing and defintions are at the heart of integration. It is more or less a communications model for locating and integrating web services that leverages DNS , UDDI , and WSDL . I'll be posting an initial model shortly. This site is using the Default theme.