This is an abstract type. Any object of this structure can be used where this type is used.
When a dimension is returned by the Titanium.UI.View.rect property,
x represents the
view's left position, and
y represents the view's top position.
The Titanium.UI.View.size property returns a dimension object with
y both set
The height measurement.
The width measurement.
The x-axis coordinate of the position. When returned by rect the position is relative to it's parent.