Answered By: Metadata and Discovery ULS
Last Updated: Aug 19, 2024     Views: 35220

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, its location on a computer network, and how to access it. It is a link that can retrieve a web-based resource. Example: https://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). It is a unique identifier for a resource but cannot be used as a clickable link. Example: isbn:9781642653779 

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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