Where are XRI and XRDS being used today?
• OpenID. The OpenID Authentication 2.0 specification supports both URL and XRI identifiers and uses the XRDS discovery format and resolution protocol defined by the XRI Resolution 2.0 specification. (For details, see OpenID Identity Discovery with XRI and XRDS, an ACM paper given at the IDtrust Symposium, March 2008.) • OAuth. The OAuth Discovery specification uses the XRDS discovery format. • LDAP directories. Companies like Boeing are using XRIs as a “universal primary key” for LDAP entries, i.e., an application-independent cross-context identifier that can be used between companies as well as internally. • Higgins. The Higgins Project, an open source user-centric digital identity framework, uses XRIs to identify Higgins context providers (plug-ins that expose native data repositories via the abstract Higgins data model). It also uses XRDS documents for discovery of the metadata necessary to open a Higgins context. • XDI.org I-Names and I-Numbers. XDI.org offers public XRI registry
