German Glider civil registration up to 1945

[Stig Jarlevik]

Guys

Can anyone explain to me how the German civil glider registration worked?

A photo on e-bay
http://cgi.ebay.com/ws/eBayISAPI.dll...m=130192673234
prompted me to check some other photos. All seems to follow a certain pattern
1) First comes the national code, D
2) Second there is a single or double digit, which I presume represent a region (Luftgau perhaps?)
3) Finally there is the registration itself.

If my assumptions are correct, does anyone have a list over the regions?
Were gliders registered independently within each region or does the final digit batch represent the overall number reached?
D-1-1, D-2-1, D-3-1 etc, or
D-1-1, D-11-2, D-9-3 etc

Sorry if this request has been posted in the past by someone else. In such a case I must have missed it or still being unaware of our daily highlight...

Cheers
Stig