The WSDL document for the Taverna 2 Server can be found at http://<SERVER:PORT>/soap?wsdl once you install the Server. If you do not have a Server running, you can see what it looks like at http://eric.rcs.manchester.ac.uk:8080/taverna-server/soap?wsdl
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The WSDL document is not really meant for consumption by humans so we will not go into details here other than to say that its functionality is equivalent to that of the REST interface.
