Well, if you want to know if that ‘something’ is URI or URL or URN, you should always mark it as a URI because all URLs and URNs are URIs. Below are the differences:
Point of Distinction | URI | URL | URN |
---|---|---|---|
Stands For | Uniform Resource Identifier | Uniform Resource Locator | Uniform Resource Name |
Subset / Superset | All URLs are not URI. | Subset of URI. All URLs are URI. | URN is also the subset of URI |
Real World Example | Your name could be a URI because it identifies you, but it couldn't be a URL because it doesn't help anyone find your location. | On the other hand, your address is both a URI and a URL because it both identifies you and it provides a location for you. | One of the best examples of URN is ISBN number which is used to uniquely identify a book. URN is completely different than URL as it doesn't include any protocol. |
Resource | The URI is the identifier of the specific resource. Like a page, or book, or a document. | URL is the locator of a resource. | Name of the resource |
Syntax | scheme:[//authority]path[?query][#fragment] where authority = [userinfo@]host[:port] | [protocol]://www.[domain_name]:[port 80]/[path or exaction resource location]?[query]#[fragment] | <URN> ::= "urn:" <NID> ":" <NSS> where <NID> is the Namespace Identifier, and <NSS> is the Namespace |
Schema | The scheme can be anything – protocol, name or specification, etc... | The scheme is always a protocol like HTTP, https, ftp, LDAP etc... | Namespace identifier or namespace specific String. |
Purpose | The main purpose of URI is to identify a resource and distinguish it from other resources using either location or name | The main purpose is to get the address or location of a resource | Uniquely identify Books and Journals |
Example | contact: +91 9999075499, urn:isbn:1234567890 | https://www.programsbuzz.com | urn:ISBN:1-23-432536-5 urn:ISSN:0167-6423 |
Use | Used in HTML, XML and tag library files like XSLT and jstl to identify resources and binaries. | URL is used to find only web pages | Find Books and Journals or any other resource with name |
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