IRI, URI, URL and URN

IRI : (Internationalized Resource Identifier), compare to URI, it's characters are Unicode which means including Chinese, Japanese and Koreans etc.

URI : (Uniform Resource Identifier ), includes URL and URN.

URL : (Uniform Resource Locator), usually using specific protocols to locate resource within World Wide Web is the most common type of URI.

URN : (Uniform Resource Name), is also one of the URI type with urn:scheme and the typical use example is ISBN system.

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