Some thoughts on group sequence resolution (correct me from wrong):

• the group execution order defined by the groups and groups sequences passed to the Validator#validate can still be resolved statically (as it is done now). There is no need to know anything about group translations or default group redefinitions
• a group transformation via @ConvertGroup (or whatever we are going to name this annotation) behaves similar to a redefined default group sequence. Effectively when the group translation is encountered a 'sub' validate call needs to be executed with the current bean as validated object and the translated groups as group parameters