Why is this mlt file created by an external tool not editable?

I used the external tool vidpy to generate a mlt file, using the example on their website.
I then try to use Shotcut to open that mlt file. However, Shotcut can only open the mlt as a clip. It cannot open the mlt as an editable project.
What in the xml determines if an mlt file can be opened as an editable project? Or can be copy-pasted into an existing project as separated editable clips on the timeline?

example.mlt (35.2 KB)

For background, I’m looking into automating part of my workflow by writing a script to generate parts of my video, and then manually editing it afterwards.

First row in the table answers your first question

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Thank you so much for linking me to that page. No way I would’ve found it on my own.