1) "DRUPAL-4-7--1" and "DRUPAL-4-7--1-0"2) "DRUPAL-4-7-V-1" and "DRUPAL-4-7-V-1-0"3) "DRUPAL-4-7-R-1" and "DRUPAL-4-7-R-1-0"4) "DRUPAL-4-7-REV-1" and "DRUPAL-4-7-REV-1-0"5) "DRUPAL-4-7_1" and "DRUPAL-4-7_1-0" (just for comparison, this isn'ta contender)I think #4 is the least ambiguous. the -- is the most concise, but I am afraidit would not be obvious to new Drupal users, or non-technical users.