WSDL file is...
WSDL can be stored in a file or be the XML response to a query, so the response from your initial request (the one with WSDL in it) should return WSDL content. If your client understands WSDL it should be able to extract the service information from it and allow you to call that service based purely on the definition specified in the WSDL. Otherwise your client would have to know some things about the specific web service like which address to use, etc.
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