Answered By: Metadata and Discovery ULS
Last Updated: Jan 05, 2018     Views: 20535

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.

FAQ Actions

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

Related Topics

Need help? Chat with us!

More ways to contact us

Contact your subject specialist
Contact your subject specialist
Explore LibGuides
Explore LibGuides

Please note:

  • Ask Us is intended for current Pitt students, faculty, and staff or questions from others regarding our unique resources and services
  • We cannot respond to medical, legal, or tax-related questions
  • Use of Ask Us is your agreement to our Privacy Policy Statement
  • Anonymized transcripts may be used to improve our service or for training