Uid (Userid); Uniqueidentifier - Netscape DIRECTORY SERVER 6.0 - SCHEMA Reference

OID
1.3.6.1.4.1.250.1.60

uid (userID)

Definition
Identifies the entry's userid (usually the logon ID). Abbreviation: uid.
For example:
userid: banderson
or
uid: banderson
This attribute is defined in RFC 1274.
Syntax
DirectoryString, multi-valued.
OID
0.9.2342.19200300.100.1.1

uniqueIdentifier

Definition
Identifies a specific item used to distinguish between two entries when a
distinguished name has been reused. This attribute is intended to detect instance of
a reference to a distinguished name that has been deleted. This attribute is assigned
by the server.
For example:
uniqueIdentifier:: AAAAAA==
This attribute is defined in RFC 1274.
Syntax
DirectoryString, multi-valued.
Chapter 3 Attribute Reference 117