The URN WG has defined a syntax for Uniform Resource Names (URNs) [RFC2141], as well as some proposed mechanisms for their resolution and use in Internet applications ([RFC2168, RFC2169]). The whole rests on the concept of individual "namespaces" within the URN structure. Apart from proof-of-concept namespaces, the use of existing identifiers in URNs has been discussed ([RFC2288]), and this document lays out general definitions of and mechanisms for establishing URN "namespaces".
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