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Q. WHAT IS THE DIFFERENCE BETWEEN A URI, URL, AND URN?


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ANSWERED BY: METADATA AND DISCOVERY ULS
LAST UPDATED: JAN 05, 2018     VIEWS: 14779

A URI (Uniform Resource Identifier) is a formal system for uniquely identifying
resources and consists of two types: URLs (Uniform Resource Locator) and URNs
(Uniform Resource Name).

A URL, also known as a web address, identifies a web resource as well as its
location on a computer network and how to access it (e.g.
http://www.library.pitt.edu).

A URN is a formal naming scheme that identifies a resource, but does not
indicate its location or how to access it (e.g. ISBN, ISSN).

Note: A URL is a link that can retrieve a web-based resource; a URN is a unique
identifier, but cannot be used to create a clickable link.

The Library’s Metadata and Discovery Unit provides metadata advice and support.
 To ask a question, set up a consultation, or learn more about our services,
contact us.

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COMMENTS (2)

 1. Examples of a URI and a URN would make this answer complete (and more
    helpful). NOTE: Since this popped up for me first on Google, so I feel
    compelled to provide feedback in case it helps others.
    by todd on Aug 30, 2023
 2. Thanks for the suggestion, Todd. We will review the FAQ entry and see if we
    can expand or improve the examples to help others.
    by Mike Bolam on Aug 31, 2023

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