!!! Overview
[{$pagename}] is used in [Microsoft Active Directory] [AttributeSchema] as the [GUID] for the [AttributeTypes][{$pagename}] is a "Unique" [GUID] that identifies this [AttributeType], used in [Security Descriptors] (SDs). If not specified on Add, the [Domain Controller] generates a [GUID]. This [GUID] [MUST NOT] be the [NULL] GUID and has the [Permission] [SystemOnly] ([NO-USER-MODIFICATION]).

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [3.1.1.2.3 Attributes|https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/cf133d47-b358-4add-81d3-15ea1cff9cd9|target='_blank'] - based on information obtained 2020-02-16