XRD

eXtensible Resource Descriptor (commonly abbreviated XRD) is an open data standard for sharing resources, particularly through services (i.e. Web Services, Identity Services or Authentication/Authorization endpoints).

Specification

• Extensible Resource Descriptor (XRD) Version 1.0: http://docs.oasis-open.org/xri/xrd/v1.0/xrd-1.0.html
• XRDS Simple - Draft 1 (now obsoleted by XRD 1.0): http://hueniverse.com/drafts/draft-xrds-simple-01.html
• OExchange: http://www.oexchange.org/spec/

Resources

• PHP library to parse "Extensible Resource Descriptor (XRD) Version 1.0": https://github.com/cweiske/XML_XRD

Tutorials

• XRDS Simple - how it works: http://hueniverse.com/misc/xrds-simple/
• OpenID and LRDD: http://hueniverse.com/2009/09/openid-and-lrdd/
• The Discovery Protocol Stack: http://hueniverse.com/2009/03/the-discovery-protocol-stack/
• XRD sneak peak: http://hueniverse.com/2009/03/xrd-sneak-peek/

External Links

• wikipedia: XRI
• wikipedia: XRDS
• XRD Begins: http://equalsdrummond.name/2008/11/30/xrd-begins/
• XRD-Based OAuth Discovery Sneak-Peek: http://hueniverse.com/2009/03/xrd-based-oauth-discovery-sneak-peek/
• XRD Sneak-Peek: http://hueniverse.com/2009/03/xrd-sneak-peek/

See Also

OAuth | OpenID | SOA | Web 2.0 | Web Service | RDF | XML | Authentication | Authorization | Identity