Internationalized Resource Identifier
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On the Internet, the Internationalized Resource Identifier (IRI) is a generalization of the Uniform Resource Identifier (URI), which is in turn a generalization of the Uniform Resource Locator (URL). While URIs are limited to a subset of the ASCII character set, IRIs may contain characters from the Universal Character Set (Unicode/ISO 10646), including Chinese or Japanese kanji, Cyrillic characters, and so forth.
It is defined by RFC 3987.