I really dont know much about soap but isnt it a simplified user interface? What would be its relationship to XML?

Ok, two months later, but Im new so...
OBviously you now have found the answer, but I explain it here for reference purposes
SOAP is basically an XML based communication protocol used to send messages (transfer data) between a client and a server usually.
The query is made by the client using an XML format, and the response it gets from the server is also in a XML format.

w3schools SOAP tutorial

cheers

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