High Quality Content by WIKIPEDIA articles! XRDS (eXtensible Resource Descriptor Sequence) is an XML format for discovery of metadata about a resource – in particular discovery 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. The XML format used by XRDS was originally developed in 2004 by the OASIS XRI (Extensible Resource Identifier) Technical Committee as the resolution format for XRIs. The acronym XRDS was coined during subsequent discussions between XRI TC members and OpenID developers at first Internet Identity Workshop held in Berkeley, CA in October 2005. The protocol for discovering an XRDS document from a URL was formalized as the Yadis specification published by Yadis.org in March 2006. Yadis became the service discovery format for OpenID 1.1.

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