Following along with a nice web service tutorial How to use the Call Web Service action , I see in Step 6 "Set the Result format to XML" . I do not see any checkbox to specifically do this. All I see under Web Service Output is "Default" and "Specify Elements". Also I see "Store result in" and a collapsible section for "Result processing"--which has a checkbox for "Force top level XML node"--which I think is for the "XSL transform"
In short the example worked without me finding this. The Send Message in plain text shows the XML output.
My confusion comes in other Web Service calls where I would like to see the XML such as "/_vti_bin/List.asmx". When I return the result, I just get plain text.
My question is when do I get Xml and when do I get Plain text.