Tag URI

Tag URI

Tag URI is a universal unique identifier protocol commonly used in various internet-related technologies and associated with data storage and transfer systems such as YAML.cite web
title = Tag URI
url = http://www.taguri.org/
accessdate = 2007-11-02] cite web
title = YAML specification
url = http://www.yaml.org/spec/current.html
accessdate = 2007-11-02]

According to RFC 4151, a tag is a type of Uniform Resource Identifier (URI) designed to meet the following requirements: [ [http://www.faqs.org/rfcs/rfc4151.html RFC 4151 (rfc4151) - The 'tag' URI Scheme ] ]

* 1. Identifiers are likely to be unique across space and time, and come from a practically inexhaustible supply.
* 2. Identifiers are relatively convenient for humans to mint (create), read, type, remember etc.
* 3. No central registration is necessary, at least for holders of domain names or email addresses; and there is negligible cost to mint each new identifier.
* 4. The identifiers are independent of any particular resolution scheme.

Examples

The following is an example tag that could be "minted" by a user to indicate authorship of a resource on the World Wide Web. The semantics of Tag URI do not require the user to currently have ownership of the Hostname upon which the tag is based, due to the date qualifier:

tag:user@example.com,2007-11-02:Tag_URI

The following example is a similar tag minted to indicate the name of the pet gerbil of the same user. Note that the semantics of Tag URI do not require the tagged entity to be accessible electronically:

tag:user@example.com,2006:Fluffy

This demonstrates that the Tag URI scheme can be used to tag any entity, object or concept.

See also

*UUID
*GUID

References


Wikimedia Foundation. 2010.

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