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'''XRI''' stands for '''Extensible Resource Identifier,''' an open standard protocol for digital addressing developed by the [[Organization for the Advancement of Structured Information Standards]] (OASIS), a non-profit consortium engaged in developing interoperability protocols for security, Cloud Computing, SOA, web services, the Smart Grid, electronic publishing, emergency management, etc.<ref>[http://www.oasis-open.org/standards www.oasis-open.org About]</ref>
'''XRI''' stands for '''Extensible Resource Identifier,''' an open standard protocol for digital identity addressing developed by the Organization for the Advancement of Structured Information Standards), a not-for-profit consortium engaged in developing interoperability protocols for security, Cloud Computing, SOA, Web services, the Smart Grid, electronic publishing, emergency management, etc.<ref>[http://www.oasis-open.org/standards www.oasis-open.org About]</ref> The characteristics of the XRI is the same as the [[Uniform Resource Identifier]]s (URIs)], which provides a simple and extensible way for identifying a resource.However, an XRI is capable of including characters beyond what is used by the generic URI and incorporates the simplification and enhancements of the URI syntax.<ref>[http://www.oasis-open.org/committees/download.php/5109/xri-syntax-resolution-1.0-cd.pdf Extensible Resource Identifier (XRI) Generic Syntax and Resolution Specification, Committee Draft, January 12, 2004]</ref>
XRI Resolution is defined as a simple and easy-to-deploy infrastructure for the purpose of resolving XRIs to [[URI|Uniform Resource Identifier]]s (URIs). It uses the [[HTTP]]s, XRDS documents, and SAML assertions enabling the discovery and selection of service endpoint metadata for any type of service associated with a resource.<ref>[http://docs.oasis-open.org/xri/xri-resolution/2.0/specs/cd03/xri-resolution-V2.0-cd-03.html#_Toc192004428 Extensible Resource Identifier (XRI) Resolution Version 2.0]</ref> XRI is able to meet the functionality requirements of the [[URN]]s (Uniform Resource Names), which is capable of identifying resources both people and organizations as well as sharing data across applications, domains and enterprises.
The XRI syntax was developed based on [[RFC]] 3986 on URIs, which provided a simple and extensible way for identifying a resource, and RFC 3987 on [[IRI]]s (Internationalized Resource Identifiers), a protocol with a sequence of characters from the Unicode/ISO 10646. XRI is capable of including characters beyond those used by the generic [[URI]] and incorporates the simplification and enhancements of the URI syntax.<ref>[http://www.oasis-open.org/committees/download.php/5109/xri-syntax-resolution-1.0-cd.pdf Extensible Resource Identifier (XRI) Generic Syntax and Resolution Specification, Committee Draft, January 12, 2004]</ref> The OASIS XRI Technical Committee explained that just like the generic URI, the XRI syntax has four optional components with the scheme name xri: For example: <tt>xri: authority / path ? query # fragment</tt>. The HTTP URIs, which use the generic URI syntax, can be changed to a valid XRI by simply changing an http URI to XRI just like this, <tt>xri://www.example.com/pages/index.html</tt> (standard HTTP URI converted to XRI).<ref>[http://www.oasis-open.org/committees/download.php/5109/xri-syntax-resolution-1.0-cd.pdf Generic Syntax]</ref>
===Key Features XRI Provides===
* Structured Identifiers
* Robust Synonym Expression and Resolution
* Uniform Extensible Discovery, Resolution, and Description Protocol
==XRI Technical Committee==
The XRI Technical Committee (XRI TC) was created for the purpose of defining the XRI. Drummond Reed from Cordance and Gabriel Wachob from VISA served as co-chairmen of the technical committee, leading the development of the following:<ref>[http://www.oasis-open.org/committees/xri/charter.php OASIS Extensible Resource Identifier TC]</ref><ref>[http://xml.coverpages.org/ni2004-01-19-a.html OASIS TC Promotes Extensible Resource Identifier (XRI) Specification]</ref>
* XRI Primer v1.0 - Introduction to XRI and its uses
* XRI Metadata Specification v1.0 - A registry of special XRI identifiers which describes other XRI identifiers
* XRI Secure Resolution Specification v1.0 - Extensions to the base XRI resolution protocol for digitally verifying resolution results
* XRI Syntax and Resolution Specification v1.1 - A revision incorporating implementation experience and feedback
==XRI Open Source Projects==
There are different XRI open resource projects maintained by the XRI community, which include:<REF>[http://dev.inames.net/wiki/Open_Source_Projects XRI Open Source Projects]</ref>
* OpenXRI
* Barx
* JanRain
* DotNetOpenId
* FoXRI
* AuthSrv
* PyAuthSrv
* Linksafe
==Internet Community Reaction on XRI==
The introduction of XRI stirred discussion within the Internet community. [[Tim Berners-Lee]] and [[Stuart Williams]], co-chairs of the [[W3C]] Technical Architecture Group, expressed their dissatisfaction with the XRI technology. Berners-Lee and Williams explained that they reviewed XRI and had not found that XRIs had functionality not readily available from URIs; as such, the XRI specification was unnecessary and should not be supported.<ref>[http://lists.w3.org/Archives/Public/www-tag/2008May/0078 TAG recommends against XRI]</ref> Some members of the Internet community expressed that the technology was untested and the registration process was confusing.<ref>
[http://lists.openid.net/pipermail/openid-general/2007-January/010335.html why is xri so obtuse?]</ref> Others advised consumers to avoid the service and commented that the Internet community did not need another centralized body to manage Internet addressing services.<ref>[http://lists.oasis-open.org/archives/xri/200707/msg00021.html Avoid XRI]</ref>
==References==
{{reflist}}
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[[Category:Glossary]]
[[Category:Glossary]]