!!! Overview
[{$pagename}] ([XRDS]) is an [XML] format for [discovery|Discovery Mechanism] of [metadata] about a web resource – in particular [discovery|Discovery Mechanism] of services associated with the [resource], a process known as service discovery. 

For [example], a website offering [OpenID] login can resolve a user's [OpenID] identifier to an [XRDS] document to discover the location of the user's [OpenID] service provider.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [XRDS|Wikipedia:XRDS|target='_blank'] - based on information obtained 2017-07-16-