What is isReference in moddle?

I’m putting together the finishing touches on my own property panel. I’m using Moddle but I can’t seem to figure out isReference. Can anyone shed some light? What is it’s purpose?

Thx

isReference marks a property as a reference to another element. There is no parent-child relationship in this case, the element just knows the other element. References are not enumerable so don’t get confused when they don’t show up when iterating over an elements properties.

Thank you Philipp. Much appreciated.