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Appendix C. Changes from RFC 3406

This document makes the following substantive changes from [RFC3406]:

  1. Relaxes the registration policy for formal URN namespaces from "IETF Review" to "Expert Review" as discussed in Section 6.2.

  2. Removes the category of experimental URN namespaces, consistent with [RFC6648]. Experimental URN namespaces were denoted by prefixing the namespace identifier with the string "X-". Because experimental URN namespaces were never registered, removing the experimental category has no impact on the existing registries. Because experimental URN namespaces are not managed, strings conforming to URN syntax within experimental URN namespaces are not valid URNs. Truly experimental usages may, of course, employ the "example" namespace [RFC6963].

  3. Adds some information to, but generally simplifies, the URN namespace registration template.