Return XML from MVC WebAPI Web Service

The tutorials to create a web service using MVC WebAPI (frmaework4.5) in VS 2013  is touted as being "very simple" to return JSON or XML.
But then, all you get is JSON. When you want to return a plain ole' string of XML ... there is no clear documentation. I see a bunch of posts where people are referencing the ActionResult method ... which is not in the APIController class... so that implies
to me that I need to roll my own from the Controller class. That doesn't seem right to me.
So ... how does one return an XML string from an MVC WebApi application?
* the list of "questions similar to yours" that this forum presents me either:  a) are for ASMX in VS 2008 or b) do not work.
Any direction to some documentation is appreciated.
Thanks

Hi,
If this issue is related to MVC, you could ask this question in the ASP.NET forum:
http://forums.asp.net. If then, you could get an answer more quickly and professional. Maybe the
WCF, ASMX and other Web Services forum will be better for this issue. Thanks for your cooperation.
Have a nice day,
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