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XRDS

XRDS

XRDS is XML document containing description of services provided by some URL. Simplified XML schema is on following image. XRDS document is get in discovery process.

XRDS schema

Example of XRDS document 

<?xml version="1.0" encoding="UTF-8"?>
<xrds:XRDS
    xmlns:xrds="xri://$xrds"
    xmlns:ux="http://specs.openid.net/extensions/ux/1.0"
    xmlns="xri://$xrd*($v*2.0)">
  <XRD>

    <Service priority="0">
      <Type>http://specs.openid.net/auth/2.0/server</Type>
      <Type>http://openid.net/sreg/1.0</Type>
      <URI priority="0">https://www.myopenid.com/server</URI>
    </Service>

    <Service>
      <Type>http://specs.openid.net/extensions/ux/1.0/friendlyname</Type>
      <ux:friendlyname>MyOpenID</ux:friendlyname>
    </Service>
    <Service>
      <Type>http://specs.openid.net/extensions/ux/1.0/img</Type>
      <ux:img url="https://www.myopenid.com/static/images/myopenid_selector.png" width="48" height="48"></ux:img>
    </Service>
  </XRD>
</xrds:XRDS>

Example of google XRDS

<?xml version="1.0" encoding="UTF-8"?>
<xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">
  <XRD>
    <Service priority="0">
      <Type>http://specs.openid.net/auth/2.0/server</Type>
      <Type>http://openid.net/srv/ax/1.0</Type>
      <Type>http://specs.openid.net/extensions/ui/1.0/mode/popup</Type>
      <Type>http://specs.openid.net/extensions/ui/1.0/icon</Type>
      <Type>http://specs.openid.net/extensions/pape/1.0</Type>
      <URI>https://www.google.com/accounts/o8/ud</URI>
    </Service>
  </XRD>
</xrds:XRDS>