劃一資源記認
劃一資源記認（Uniform Resource Identifier），簡寫URI，喺電腦來講，係一串字符記認，用同來分清同標明互聯網上嘅資源。呢個記認可以代表網上資源，用特定協定交通，尤其係萬維網上便。個記認有特定文法同相關網上協定。
劃一資源記認係夾埋劃一資源名（Uniform Resource Name）同埋劃一資源地址（Uniform Resource Locator）兩者嘅特性而來。前者強調係個名，後者強調點搵到。例如有本書羅密歐與茱麗葉（Romeo and Juliet），個國際書號係ISBN 0-486-27557-4，可以用urn:isbn:0-486-27557-4來表示，呢個就係佢劃一資源名。而真正想睇本，本書個檔案就放喺file:///home/username/RomeoAndJuliet.pdf，呢個就佢嘅劃一資源地址。
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