ISSUE-2248 (Scale on a 2D object): 3. TransformList Extensions - Scale on a 2D object

ISSUE-2248 (Scale on a 2D object): 3. TransformList Extensions - Scale on a 2D object

http://www.w3.org/Graphics/SVG/WG/track/issues/2248

Raised by: Anthony Grasso
On product: 

In section 3. TransformList Extensions, under scale(<sx> [<sy>
[<sz>]])

This states "If <sy> and <sz>  are not provided, it is assumed to be
equal to <sx>." What is the value of <sz> if <sx> and <sy> are
provided? If all objects are actually 2D, does scaling have any effect
beyond the translation effect due to the Z coordinate scaling?