Is there a difference between the 2008 and 2009 namespace for Deep Zoom Images?

Question

I noticed that Deep Zoom Composer writes DZIs with a namespace of

http://schemas.microsoft.com/deepzoom/2009

However the official documentation and the only available schema refer to

http://schemas.microsoft.com/deepzoom/2008

XML dictates I cannot treat them as equivalent, although they seem to be. So does anyone know if there is a difference and even better, can point to some documentation?

Answer 1

Talking with the program manager for Seadragon at that time, he believes the only thing that was added was an optional extra tag to support Microsoft's Smooth Streaming server feature. If you're not using Smooth Streaming, the 2008 schema is identical to the 2009 one.