Subject: URIs, URLs, and URNs
Author: WebSpider
Posted on: 06/29/2006 01:39:11 PM

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A URI is a uniform resource identifier while a URL is a uniform resource locator. Hence every URL is a URI, abstractly speaking, but not every URI is a URL. This is because there is another subcategory of URIs, uniform resource name (URN), which names resources but do not specify how to locate them. The mailto, news, and isbn URIs shown above are examples of URNs.

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References:

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