Generating unique ids in Mnesia

[Joel Reymont]

I think I solved the problem. I'll rely on a separate counter table  
and mnesia:dirty_update_counter(). The counter table will be a set,  
keyed on the counter type.

-record(counter, {
       type,
       value
      }).

My understanding from the documentation is that  
mnesia:dirty_update_counter() atomically _increments_ the counter and  
the increments part is key. The idea won't work otherwise.

     Joel