A string that is an identifier, and therefore must be either a string representation of an OID (see ISO/IEC 8824:1990(E)), a UUID (see Open Group, CDE 1.1 Remote Procedure Call specification, Appendix A), or a simple token taken from a list of controlled names for the context in which the Uid is used. Notes:
- UUIDs SHALL always be represented in uppercase
- Uid comparison is always case sensitive