[Qt-qml] aliases

[Henry Gomersall]

The documentation for aliases
(http://doc.qt.nokia.com/latest/qml-extending-types.html#default-properties)  presents the following example: 

// Button.qml
 import QtQuick 1.0

 Item {
     property alias buttonText: textItem.text

     width: 200; height: 50

     Text { id: textItem }
 }

with the comment:
"In this case, the use of aliased properties is essential. If buttonText
was not an alias, changing its value would not actually change the
displayed text at all, as property bindings are not bi-directional: the
buttonText value would change when textItem.text changes, but not the
other way around."

My question is, why is using aliases in this example better than the
following, which seems to achieve the same goal: 

// Button.qml
 import QtQuick 1.0

 Item {
     property string buttonText

     width: 200; height: 50

     Text { id: textItem; text: parent.buttonText }
 }

Cheers,

Henry