!!! Overview[1]
[{$pagename}] is an [AttributeType] defined in [RFC 3112] with an OID of [1.3.6.1.4.1.4203.1.3.3]

The values of this attribute are names of supported [authentication] [password Storage Schemes] which the server supports.  The syntax of a [password Storage Schemes] names are described in [authPasswordSyntax].  

[{$pagename}] [MAY] only be present in the [RootDSE]. If the server does not support any [password Storage Schemes], [{$pagename}] will _NOT__ be present.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [DIT and the LDAP Root DSE|https://www.ldap.com/the-directory-information-tree/|target='_blank'] - based on information obtained 2016-04-22-