The MIME Multipart/Related Content-type (RFC2112)
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
The Multipart/Related content-type provides a common mechanism for representing objects that are aggregates of related MIME body parts. This document defines the Multipart/Related content-type and provides examples of its use.
Network Working Group E. Levinson
Request for Comments: 2112 XIson, Inc.
Category: Standards Track March 1997
The MIME Multipart/Related Content-type
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
The Multipart/Related content-type provides a common mechanism for
representing objects that are aggregates of related MIME body parts.
This document defines the Multipart/Related content-type and provides
examples of its use.
Several applications of MIME, including MIME-PEM, and MIME-Macintosh
and other proposals, require multiple body parts that make sense only
in the aggregate. The present approach to these compound objects has
been to define specific multipart subtypes for each new object. In
keeping with the MIME philosophy of having one mechanism to achieve
the same goal for different purposes, this document describes a
single mechanism for such aggregate or compound objects.
The Multipart/Related content-type addresses the MIME representation
of compound objects. The object is categorized by a "type"
parameter. Additional parameters are provided to indicate a specific
starting body part or root and auxiliary information which may be
required when unpacking or processing the object.
Multipart/Related MIME entities may contain Content-Disposition
headers that provide suggestions for the storage and display of a
body part. Multipart/Related processing takes precedence over
Content-Disposition; the interaction between them is discussed in
Responsibility for the display or processing of a Multipart/Related's
constituent entities rests with the application that handles the
2. Multipart/Related Registration Information
The following form is copied from RFC 1590, Appendix A.
To: IANA@isi.edu Subject: Registration of new Media Type content-
Media Type name: Multipart
Media subtype name: Related
Required parameters: Type, a media type/subtype.
Optional parameters: Start
Encoding considerations: Multipart content-types cannot have
Security considerations: Depends solely on the referenced type.
Published specification: RFC-REL (this document).
Person & email address to contact for further information:
47 Clive Street
Metuchen, NJ 08840-1060
+1 908 494 1606