def add_repetition(pRepetition, pBehaviour = Languages::KEEP_LEVEL)
      return nil unless (pRepetition.instance_of?Languages::RepetitionData)
      add_with_manager(pRepetition, 'repetition', pBehaviour)
    end
def add_repetition(pRepetition, pBehaviour = Languages::KEEP_LEVEL)
      return nil unless (pRepetition.instance_of?Languages::RepetitionData)
      add_with_manager(pRepetition, 'repetition', pBehaviour)
    end
Add repetition element inside function.
 @param pRepetition An object of RepetitionData.
 @return If pRepetition is not RepetitionData instance return nil.