RFC 2912 (rfc2912) - Page 2 of 11

Indicating Media Features for MIME Content

RFC 2912       Indicating Media Features for MIME Content September 2000


Table of Contents

   1. Introduction ...............................................  2
      1.1 Terminology and document conventions ...................  2
   2. Motivation and goals .......................................  3
   3. The 'Content-features:' MIME header ........................  4
      3.1 Whitespace and folding long headers ....................  4
      3.2 Usage considerations ...................................  4
        3.2.1 Simple message parts ...............................  4
        3.2.2 Multipart and other composites .....................  5
        3.2.3 Reference to external data .........................  5
   4. Examples ...................................................  5
      4.1 Simple message .........................................  5
      4.2 Fax message ............................................  6
      4.3 Multipart/alternative data .............................  6
      4.4 Reference to external message data .....................  8
      4.5 Compressed data ........................................  8
      4.6 Multipart/related data .................................  8
   5. Security Considerations ....................................  9
   6. Acknowledgements ........................................... 10
   7. References ................................................. 10
   8. Author's Address ........................................... 10
   Full Copyright Statement ...................................... 11

1. Introduction

   In "A Syntax for Describing Media Feature Sets" [1], an expression
   format is presented for describing media feature capabilities as a
   combination of simple media feature tags, registered according to
   "Media Feature Tag Registration Procedure" [2].  This provides a
   format for message handling agents to describe the media feature
   content of messages that they can handle.

   This memo defines a MIME 'Content-features:' header that can be used
   to annotate a MIME message part using these feature expressions.
   This header provides a means to indicate media-related features of
   message content that go beyond the MIME content type.

   Consideration is also given to how it may be used to present message
   media content information that is problematic to express within the
   basic MIME framework.

1.1 Terminology and document conventions

   This section defines a number of terms and other document
   conventions, which are used with specific meaning in this memo.





Klyne                       Standards Track