The <$include> tag and external Scrivener links

Before I get fancy with some organizational methods I’m pondering, can anyone tell me if an external “x-scrivener-item:///path/to/project.scriv?id=UUID&key=value” style link is supposed work with the <$include> tag? I’ve made an attempt to include a file from another project by adding <$include> to its own line in one document, and then linking the x-scrivener-item url to that tag, but it just comes out as “<$include>” in the compiled output.

Assuming I’m not barking up the wrong directory tree, and there is a way to do this, will the styled text remain styled if both projects have identical style names?

From the Placeholder Tags List, available from the Help menu:

So you would need a true path name, not a link.

Katherine