Cannot create a list property of a custom QML object type

I'm trying to create a list property containing my own QML objects, e.g.:
import QtQuick 2.1
import system.items 1.0 as System

Rectancle {
...
property list<System.QMLDboAnalog> someObjectList:
[
System.QMLDboAnalog

{ id: averageValue objectID: averageValueObjectID }

// Path Value Objects
System.QMLDboAnalog

{ id: valuePath1 objectID: pathValueObjectIDList[0] }

]

QtCreator does not like the "System." prefix in the list type.
Am I doing something wrong here?