Final answer:
In WSDL, the URL of a web service is usually found in the 'soap:address' element within the 'service' element, which includes the 'location' attribute specifying the web service endpoint.
Step-by-step explanation:
In WSDL (Web Services Description Language), the URL where the service is located is typically stored in the service element. Within this service element, you will find one or more port elements.
Each port element includes the concrete address of the service, defined by a soap:address element (when using SOAP over HTTP). This soap:address element contains a location attribute that provides the actual URL of the web service endpoint.