Applies to Types

Says which Types this meta-Property is relevant to -- Collection: Set Type: Thing Type

A "meta-Property" is a Property that you put on other Properties, to describe their behavior. For example, Maximum Number Value is a meta-Property that you put on a Whole Number Property, giving the largest value allowed in that Whole Number.

Meta-Properties should usually specify Applies to Types, to describe which Types they are relevant on. When you create a Property of one of those Types, all Meta-Properties that point to it will be shown in the Property Editor.

This is an extremely advanced meta-Property, mostly used internally, but it may be more useful for user code in the future.