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| Extensible Resource Descriptor ： ウィキペディア英語版 |
XRDS
XRDS (eXtensible Resource Descriptor Sequence) is an XML format for discovery of metadata about a web 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.
== Background ==
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.
A common discovery service for both URLs and XRIs proved so useful that in November 2007 the (XRI Resolution 2.0 ) specification formally added the URL-based method of XRDS discovery (Section 6). This format and discovery protocol subsequently became part of (OpenID Authentication 2.0 ).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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