URI Reference

A URI Reference is a character string used to identify a name of a web resource.

• Example(s):
  • http://en.wikipedia.org/wiki/URI#Examples_of_URI_references ("http” specifies the 'scheme' name, “en.wikipedia.org” is the 'authority', “/wiki/URI” the 'path' pointing to this article, and “#Examples_of_URI_references” is a 'fragment' pointing to this section.)
  • http://example.org/absolute/URI/with/absolute/path/to/resource.txt
  • //example.org/scheme-relative/URI/with/absolute/path/to/resource.txt
  • /relative/URI/with/absolute/path/to/resource.txt
  • relative/path/to/resource.txt
  • ../../../resource.txt
  • ./resource.txt#frag01
  • resource.txt
  • #frag01
  • (empty string)
• See: IRI, URN, URL, RDF Triple.

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References

2013

• http://en.wikipedia.org/wiki/Uniform_resource_identifier
  • In computing, a uniform resource identifier (URI) is a string of characters used to identify a name of a web resource. Such identification enables interaction with representations of the web resource over a network (typically the World Wide Web) using specific protocols. Schemes specifying a concrete syntax and associated protocols define each URI.

2009

URI/URL Syntax: scheme: scheme-specific-part http://user:pass@example.com:992/animal/bird?species=seagull#wings \__/ \_______/ \__________/\__/\_________/\_____________/\____/ | | | | | | | protocol login host port path query anchor/fragment URN Syntax: <URN> ::= "urn:" <NID> ":" <NSS>

<scheme>:<scheme-specific-part>

• <scheme>://<authority><path>?<query>
• New in RFC 3986 (replaces RFC 2396)

<scheme>://<authority><path>?<query>#<fragment>

• Uniform Resource Locator (URL)

– Subset of URI that identify resources via a representation of their primary access mechanism (e.g., their network “location”)

• Uniform Resource Name (URN)

– Subset of URI that remain globally unique and persistent even when the resource ceases to exist or becomes unavailable – URNs are not necessarily retrievable

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