Summarizes Property

Optional pointer from a Summary Property to the Property that it summarizes -- Collection: Required Type: Thing Type

This link is sometimes necessary when you have a User Value Property that is a Model Type. If you want to summarize such a Property (in order to examine its statistics), you aren't actually summarizing the entire Property -- you're just summarizing a Property inside that Model Type. This lets you specify which Property of the Model Type should be summarized.

For example, take the Review Property. The summary for that isn't based on the entire Review -- it is based on the Rating Property inside the Review. So the Summary needs to point to Rating, to know what to do.

This is a very advanced Property, intended only for people who are building complex User Value Properties.