Web config transform on microsoft.identityModel - 'http://schemas.microsoft.com/XML-Document-Transform' attribute is not declared

Question

I have got a Web.Release.config that is successfully transforming a connection string.

When I add a microsoft.identityModel section I get a warning saying

Answer 1

This appears to be working now with Visual Studio 2012 (v4.5.50709). I still get the 'attribute is not declared' warning in the editor, but the xdt:Transform="Replace" directive is working for me.