Form Descriptor Object
OK, I'm missing something. It's probably obvious, but I'm not seeing it.
MktoForms2 has a method called newForm() which looks potentially useful. It takes a Form Descriptor Object as an argument. But aside from the quick "as created by the Marketo Forms V2 editor" mentioned at the end of it, I don't see a definition for it or even where to get one so I can look at it. I went through the form editor, closest reference I could find was the form embed code, which isn't it. None of the other methods listed on the page return one. Plenty of ways to get a Form object, but that's not it (I tried and it errors out).
So, what did I miss? Where do I get my digital claws on a Form Descriptor Object?