The IETF tree is intended for types of general interest to the
   Internet Community. Registration in the IETF tree requires approval
   by the IESG and publication of the media type registration as some
   form of RFC.

   Media types in the IETF tree are normally denoted by names that are
   not explicitly faceted, i.e., do not contain period (".", full stop)
   characters.

   The "owner" of a media type registration in the IETF tree is assumed
   to be the IETF itself.  Modification or alteration of the
   specification requires the same level of processing (e.g.  standards
   track) required for the initial registration.

2.1.2.  Vendor Tree

   The vendor tree is used for media types associated with commercially
   available products.  "Vendor" or "producer" are construed as
   equivalent and very broadly in this context.






 
RFC 2048              MIME Registration Procedures         November 1996


   A registration may be placed in the vendor tree by anyone who has
   need to interchange files associated with the particular product.
   However, the registration formally belongs to the vendor or
   organization producing the software or file format.  Changes to the
   specification will be made at their request, as discussed in
   subsequent sections.

   Registrations in the vendor tree will be distinguished by the leading
   facet "vnd.".  That may be followed, at the discretion of the
   registration, by either a media type name from a well-known producer
   (e.g., "vnd.mudpie") or by an IANA-approved designation of the
   producer's name which is then followed by a media type or product
   designation (e.g., vnd.bigcompany.funnypictures).

   While public exposure and review of media types to be registered in
   the vendor tree is not required, using the ietf-types list for review
   is strongly encouraged to improve the quality of those
   specifications. Registrations in the vendor tree may be submitted
   directly to the IANA.

2.1.3.  Personal or Vanity Tree

   Registrations for media types created experimentally or as part of
   products that are not distributed commercially may be registered in
   the personal or vanity tree.  The registrations are distinguished by
   the leading facet "prs.".

   The owner of "personal" registrations and associated specifications
   is the person or entity making the registration, or one to whom
   responsibility has been transferred as described below.

   While public exposure and review of media types to be registered in
   the personal tree is not required, using the ietf-types list for
   review is strongly encouraged to improve the quality of those
   specifications.  Registrations in the personl tree may be submitted
   directly to the IANA.

2.1.4.  Special `x.' Tree

   For convenience and symmetry with this registration scheme, media
   type names with "x." as the first facet may be used for the same
   purposes for which names starting in "x-" are normally used.  These
   types are unregistered, experimental, and should be used only with
   the active agreement of the parties exchanging them.








 
RFC 2048              MIME Registration Procedures         November 1996


   However, with the simplified registration procedures described above
   for vendor and personal trees, it should rarely, if ever, be
   necessary to use unregistered experimental types, and as such use of
   both "x-" and "x." forms is discouraged.

2.1.5.  Additional Registration Trees

   From time to time and as required by the community, the IANA may,
   with the advice and consent of the IESG, create new top-level
   registration trees.  It is explicitly assumed that these trees may be
   created for external registration and management by well-known
   permanent bodies, such as scientific societies for media types
   specific to the sciences they cover.  In general, the quality of
   review of specifications for one of these additional registration