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===Experimental=== An exception to the registration requirement was formerly made for "experimental namespaces".{{sfnp|RFC 3406|2002}} However, following the deprecation of the "X-" notation for new identifier names,{{sfnp|RFC 6648|2012}} {{IETF RFC|8141|link=no}}{{sfnp|RFC 8141|2017}} did away with experimental URN namespaces, indicating a preference for use of the <code>urn:example</code> namespace where appropriate.{{sfnp|RFC 6963|2013}}
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