Config Transforms for Elements

I would have thought this was obvious, but it took me a bit to figure it out.  The config file transforms that are available for web.config files and for all other files can be used to replace sections of a config file, based on a project configuration.  Most of the examples show changing attributes.  I wanted to change the entire element, in this instance, connectionStrings.  To do this, you simply put the Replace value in the Transform attribute on the element: