It should be possible to give components defined inline a type-name too.

import Qt 4.7

Rectangle {
    width: 640; height: 480;

    // This works because an instance of "blueRect" is created (?) here
    Component  {
        id: "blueRect"
        Rectangle {
            width: 100
            height: 100
            color: "blue"
        }
    }

    Repeater {
        model: 1
        delegate: blueRect  // blue-rect instance used here
    }

    // Can't instantiate a component from an instance-id
    blueRect { x: 200; y: 100 }

    // This syntax is not supported. The component needs to be moved to RedRect.qml
    Component RedRect {
        Rectangle {
            width: 100
            height: 100
            color: "red"
        }
    }

    // None of this will only work unless RedRect is moved to RedRect.qml
    RedRect { x: 200; y: 200 }
    RedRect { x: 300; y: 300 }
    Repeater {
        model: 1
        delegate: RedRect {}
    }
}