http://www.ietf.org/rfc/rfc2369.txt (RFC)
웹에서 리소스들을 구별하기 위한 간단한 문자열. 이것을 이용하여 문서와 다운로드할 파일들, 이미지들, 서비스들, 그리고 다른 공유된 정보의 리소스들을 구별한다.
예를들어
file : file://usr/bin/python
인터넷에서 논리적인 이름으로 영구정보를 식별하는데 URN을 사용한다.
The basic picture, specified in section 1.2. URI, URL, and URN of RFC 2396, looks like this:
_______________________________________________________ | ________________ | | | ftp: | | | | gopher: | | | | http: __|____________ | | | etc | | urn: | | | |_____________|__| | | | URLs | | | | |_______________| | | URNs | |_______________________________________________________| URIs
- URI : Uniform Resource Identifier. The generic set of all names/addresses that are short strings that refer to resources.
URL : Uniform Resource Locator. An informal term (no longer used in technical specifications) associated with popular URI schemes: http, ftp, mailto, etc.
- URN : Uniform Resource Name.
- An URI that has an institutional commitment to persistence, availability, etc. Note that this sort of URI may also be a URL. See, for example, PURLs.
- A particular scheme, urn:, specified by RFC2141 and related documents, intended to serve as persistent, location-independent, resource identifiers.