Override schemas.xmlsoap.org/soap/envelope

Hello there!

I'm trying to connect to a webservice which has (for some reason) it's own envelope validation schema and not de default schemas.xmlsoap.org/soap/envelope.

This schema requires a header and a content - element. Yes, a content-element instead of a body-element!
However, when I leave the body-element out of my message, my client refuses to send the message because the body-element is missing. And when I add an empty body element, the webservice refuses the message because it doesn't know what to do with the body-element!

So, I am trying to change my message in which the default schemas.xmlsoap.org/soap/envelope is replaced by the provided xsd. I have no idea to get this to work.

Does anyone have an idea???