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6.1. Overview

Because the space of URN namespaces is itself managed, the definition of a URN namespace should pay particular attention to:

  1. Global uniqueness: Ensuring the namespace identifier (NID) is globally unique
  2. Persistence: Ensuring assigned URNs remain valid and resolvable long-term
  3. Managing authority: Clearly identifying the organization or entity responsible for namespace management
  4. Assignment policies: Defining how URNs are assigned and managed within the namespace
  5. Syntax rules: Specifying the format and constraints for the namespace-specific string (NSS)

URN namespace registration requires submission of a complete namespace definition document, which should use the standard template described in subsequent sections of this chapter. The registration process ensures:

  • The proposed NID does not conflict with existing namespaces
  • The namespace definition meets technical and administrative requirements
  • The community has opportunity to review and comment on the proposed namespace
  • Long-term maintenance and management of the namespace is guaranteed

The registration process is coordinated by IANA and follows different policies (Community or Fast Track) depending on the namespace type.

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