WikiMarkup: Ordered List

Hi list,

is it possible to define ordered lists that renders digits instead of letters on second level ?
Currently i get:

1. First Level
   A. Second Level
      a. Third Level
   B. Second Level
   C. Second Level
2. First Level



I'd like to produce:

1. First Level
   1. Second Level
      1. Third Level
   2. Second Level
   3. Second Level
2. First Level

Any hints are welcome.

Regards,
Tilman