Entity property placeable_by

[Atria]

I was looking for ways to place entity created from different entities. And it struck me that rails already implement this. Curve rail entity prototype has entity

Code: Select all

placeable_by = {item='rail', count=4}

Can this be used to place different entity (which doesn't have recipe) using robots (robots would pick up items specified and place wanted entity)? Or is it exclusive rail thing?