This document provides a procedure for establishing some of the Label Generation Rules for the root zone. The procedure provides a mechanism for creating and maintaining the rules with respect to IDN labels for the root.
This mechanism can be used to determine which Unicode code points are permitted for use in U-labels in the root zone, what variants (if any) are possible to allocate in the root zone, and what variants (if any) are automatically blocked. The mechanism is not the last stage in making determinations about IDN labels for the root. Rather, its output is to be consumed by other ICANN procedures that actually determine whether a particular label is allocated to someone, and whether it is delegated in the root.