Atom配信フォーマット（IANAによる考察）

   An Atom Document, when serialized as XML 1.0, can be identified with
   the following media type:
   MIME media type name:  application
   MIME subtype name:  atom+xml
   Mandatory parameters:  None.
   Optional parameters:
      "charset":  This parameter has semantics identical to the charset
         parameter of the "application/xml" media type as specified in
         [RFC3023].
   Encoding considerations:  Identical to those of "application/xml" as
      described in [RFC3023], Section 3.2.
   Security considerations:  As defined in this specification.
      In addition, as this media type uses the "+xml" convention, it
      shares the same security considerations as described in [RFC3023],
      Section 10.
   Interoperability considerations:  There are no known interoperability
      issues.
   Published specification:  This specification.
   Applications that use this media type:  No known applications
      currently use this media type.
   Additional information:
   Magic number(s):  As specified for "application/xml" in [RFC3023],
      Section 3.2.
   File extension:  .atom
   Fragment identifiers:  As specified for "application/xml" in
      [RFC3023], Section 5.
   Base URI:  As specified in [RFC3023], Section 6.
   Macintosh File Type code:  TEXT
   Person and email address to contact for further information:  Mark
      Nottingham <mnot@pobox.com>
   Intended usage:  COMMON
   Author/Change controller:  IESG

   This registry is maintained by IANA and initially contains five
   values: "alternate", "related", "self", "enclosure", and "via".  New
   assignments are subject to IESG Approval, as outlined in [RFC2434].
   Requests should be made by email to IANA, which will then forward the
   request to the IESG, requesting approval.  The request should use the
   following template:

   o  Attribute Value: (A value for the "rel" attribute that conforms to
      the syntax rule given in Section 4.2.7.2)
   o  Description:
   o  Expected display characteristics:
   o  Security considerations: