!!! Overview 

[Attributes] flagged [{$pagename}] should be used for attribute types that store operational data that should be stored only in one server and should __NOT__ be replicated throughout the directory environment. 

A usage of directoryOperation, distributedOperation, or [{$pagename}] indicates that attributes of this type represent operational and/or administrative information. That is, they are [Operational Attributes]. ([RFC 4512])

!! More Information 
There might be more information for this subject on one of the following: 
[{ReferringPagesPlugin before='*' after='\n' }] 

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* [#1] - [http://www.rfc-editor.org/rfc/rfc4512.txt|http://www.rfc-editor.org/rfc/rfc4512.txt|target='_blank'] - based on 2013-04-10