!!! Overview
[{$pagename}] is a __REQUIRED__ [OAuth Parameters Registry] entry in the [Assertion Framework for OAuth 2.0 Client Authentication and Authorization Grant] to indicate the format of the [assertion] as defined by the [Authorization Server].  

The [{$pagename}] value will be an absolute [URI].

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