!!! Overview
[{$pagename}] implies old.

!! [{$pagename}] [Request For Comment] ([RFC]) 
[RFC Status] of [{$pagename}] is one that the technology defined by the [RFC] [NOT RECOMMENDED] for use, which differs from "[OBSOLETE]" header in a replacement [RFC]. 

For [example], [RFC 821] ([SMTP]) itself is [OBSOLETE] by various newer [RFCs], but [SMTP] itself is still "current technology", so it is not in "[{$pagename}]" status.

On the other hand, since [BGP] version 4 has entirely superseded earlier [BGP] versions, the [RFCs] describing those earlier versions (e.g. [RFC 1267]) have been designated [{$pagename}].

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