This article will also help with this workflow (in case any stumbles upon this question looking for more).
https://knowledge.safe.com/articles/45314/working-with-soap-services.html
Further to the other comments, I'd agree that a good way to do this is with a combination of the XMLTemplater to build the request and the HTTPCaller (new name) to post the SOAP request itself.I have attached an example that I built to do a similar request against a road works service, by running in prompt and run mode you can issue all the parameters required by the SOAP service.
More on this and other similar approaches in this webinar:
In addition to what Takashi said, there is also the XMLTemplater in conjunction with the HTTPCaller to construct and transmit the SOAP request.
If you are looking for a way to extract the XML element values as feature attributes, the XMLFlattener or XMLFragmenter might help you.