| Uniform Resource Identifier | ||||||
| URL | Uniform Resource Locator | http://www.jacksonelect.com | ||||
| URN | Uniform Resource Name | urn:NID:NSS | NID is the namespace identifier | |||
| Example: urn:isbn:0-619-01969-7 | NSS is a text string specific to that namespace | |||||
| NID indicates how to interpret the text string in the NSS | ||||||