REST Service that does POST and needs to receive ANY xml format

using version 9.12

All - trying to write a REST service that receives a POST request and in msg body receive any XML document. In my input/output is have utilized NODE (object). Since I don’t know the exact structure of every document how to I accept that as a document?

just use the regular string field should be fine, call it XMLString for example.
you don’t want to define the xml structure in the Rest interface since you want to support ANY xml.