3.1. Uniform Resource Names and Uniform Resource Locators
URIs identify namespaces. URIs take the form of Uniform Resource Names (URNs) or Uniform Resource Locators (URLs). URNs identify a resource by giving it a globally unique and persistent name. The following is a typical URN:
urn:example:mytags
in which ‘urn’ identifies the Uniform Resource Name scheme, which means that this URI is a URN, ‘example’ is a namespace identifier (NID), and ‘mytags’ is a namespace-specific string (NSS).
Do not confuse namespace in the URN syntax description with the concept of Namespace from the Namespace Recommendation. The URN specification has its own concept of namespaces.
URLs uniquely identify the location of a resource. Browsing the Web wouldn’t be possible ...
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