## Aside: URLs, URIs, and URNs

In the context of the web, all URIs are URLs!

- URI: Uniform Resource Identifier
  - URL: Uniform Resource Locator
  - URN: Uniform Resource Name

Huh? A name may be unique, but may not tell you anything about how to locate it.

"Designing Your New Work Life" by Bill Burnett and Dave Evans is a book.
It can be uniquely identified by the URN `isbn:9780593467459`, and various URLs can be used to locate it (well, if not locate it, at least locate how to purchase or locate it in a library)
https://www.amazon.com/Designing-Your-Work-Life-Happiness/dp/0593467450/
https://www.barnesandnoble.com/w/designing-your-new-work-life-bill-burnett/1140537816
https://designingyour.life/designing-your-new-work-life/
https://www.abebooks.com/9780593467459/Designing-New-Work-Life-Thrive-0593467450/plp
https://www.worldcat.org/title/1256628247?oclcNum=1256628247