Using slots?

if I have entities like this :

* substring of a [string](type)

but nothing is declared in domain.yaml is the slot used ?

What problem are you trying to solve?

If you dont specify a slot it cant be filled, so I dont see where this question is aiming at.

I’m unsure how it works ? Does it autovivify implicitly if I just use it OR I have to explicitly have to declare it in domain.yaml so I can use it in

This should answer your questions

that’s the problem the documentation does not explain that !!