Universal Resource Identifier (URI, originally "UDI" in some documents) The generic set of all names and addresses which are short strings which refer to objects (typically on the ). The most common kinds of URI are s and {relative URLs}. URIs are defined in . {W3 specification (http://www.w3.org/hypertext/WWW/Addressing/URL/URI_Overview.html)}. (1997-07-16)