validates :system_picture_id, :presence => true, :numericality => true, :existence => {:both => false}
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 :system_picture_id, :presence => true, :numericality => true, :existence => {:both => false}
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