Hello, Thank you for this amazing program! I couldn’t resist posting a link to this page when I just decided to browse this Full List of Features page again. Wow, Shotcut can do a lot. What great software.
“MLT XML file” refers to the file that is created when you save your editing project. So what that is telling you is that you can take your project file and open up it in a separate project as if it was its own video clip for you to use in that separate project.