RFC 3553 (rfc3553) - Page 2 of 8

An IETF URN Sub-namespace for Registered Protocol Parameters

RFC 3553                   IANA URN Namespace                  June 2003


2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119.

3.  IETF Sub-namespace Specifics

   Sub-namespace name:

      params

   Declared registrant of the namespace:

      The Internet Engineering Task Force

   Declaration of structure:

      The namespace is primarily opaque.  The IANA, as operator of the
      registry, may take suggestions for names to assign but they
      reserve the right to assign whatever name they desire, within
      guidelines set by the IESG.  The colon character (":") is used to
      denote a very limited concept of hierarchy.  If a colon is present
      then the items on both sides of it are valid names.  In general,
      if a name has a colon then the item on the left hand side
      represents a class of those items that would contain other items
      of that class.  For example, a name can be assigned to the entire
      list of DNS resource record type codes as well as for each
      individual code.  The URN for the list might look like this:

            urn:ietf:params:dns:rr-type-codes

      while the URN for the SOA records type code might look like this:

            urn:ietf:params:dns:rr-type-codes:soa

   Relevant ancillary documentation:

      [3], [2], [1]

   Identifier uniqueness considerations:

      The IESG uses the IETF consensus process to ensure that
      sub-namespaces generate unique names within that
      sub-namespace.  The IESG delegates to the IANA the task of
      ensuring that the sub-namespace names themselves are unique.
      Until and unless the IESG specifies differently, the IANA is
      directed to ensure uniqueness by comparing the name to be assigned



Mealling, et. al.        Best Current Practice