The format of the date string. Defines the rules that must be followed to confirm the identity of a person through biometric verification. Specifies a biometric verification rule. The format of the image. The height of the image. The width of the image. The Interocular Distance (IOD) ratio. This value represents the ratio of the distance between the eyes to the width of the image. The Eye Position Ratio. This value represents the ratio of the distance from the top of the image to the eyes to the height of the image.