+ validates :speech_balloon_id, :presence => true, :numericality => true, :existence => true
+ validates :system_picture_id, :presence => true, :numericality => true, :existence => true
+ validates :x, :presence => true, :numericality => true
+ validates :y, :presence => true, :numericality => true
+ validates :width, :presence => true, :numericality => true, :natural_number => true
+ validates :height, :presence => true, :numericality => true, :natural_number => true
+# validates :caption, :presence => true
+# validates :settings, :presence => true
+