A URI can be further classified as a locator, a name, or both. The

term "Uniform Resource Locator" (URL) refers to the subset of URI

that identify resources via a representation of their primary access

mechanism (e.g., their network "location"), rather than identifying

the resource by name or by some other attribute(s) of that resource.

The term "Uniform Resource Name" (URN) refers to the subset of URI

that are required to remain globally unique and persistent even when

the resource ceases to exist or becomes unavailable.


The following examples illustrate URI that are in common use.


ftp://ftp.is.co.za/rfc/rfc1808.txt

-- ftp scheme for File Transfer Protocol services



gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles

-- gopher scheme for Gopher and Gopher+ Protocol services



http://www.math.uio.no/faq/compression-faq/part1.html

-- http scheme for Hypertext Transfer Protocol services



mailto:mduerst@ifi.unizh.ch

-- mailto scheme for electronic mail addresses


news:comp.infosystems.www.servers.unix

-- news scheme for USENET news groups and articles

telnet://melvyl.ucop.edu/
-- telnet scheme for interactive services via the TELNET Protocol