The +exi Media Type Suffix
draft-shelby-exi-registration-02

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Last updated 2017-03-14 (latest revision 2017-02-27)
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Appsawg                                                        Z. Shelby
Internet-Draft                                      Micro:bit Foundation
Intended status: Informational                               O. Bergmann
Expires: August 26, 2017                                      C. Bormann
                                                 Universitaet Bremen TZI
                                                       February 22, 2017

                       The +exi Media Type Suffix
                    draft-shelby-exi-registration-02

Abstract

   Efficient XML Interchange (EXI) is an XML representation technique
   specified by the W3C to provide a time and space efficient encoding
   for XML documents.  This document defines a new Structured Syntax
   Suffix "+exi" for use in a specific class of protocols, where "exi"
   content-type encoding or the generic "application/exi" media type are
   not applicable.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 26, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Shelby, et al.           Expires August 26, 2017                [Page 1]
Internet-Draft                    +exi                     February 2017

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  When to Use the +exi Suffix . . . . . . . . . . . . . . . . .   3
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Efficient XML Interchange (EXI) [W3C.REC-exi-20140211] is an XML
   representation technique specified by the W3C to provide a time and
   space efficient binary encoding alternative to the standard text XML
   representation.  EXI is not a generic compression technique like gzip
   or deflate, but an encoding technique specifically for XML structured
   documents, which uses either learned or pre-informed schema
   information.

   [W3C.REC-exi-20140211] defines a generic media type for documents
   encoded in EXI, "application/exi"; this does not provide a way to
   indicate more information about structure and semantics of the EXI-
   encoded XML.  Also, [W3C.REC-exi-20140211] defines an HTTP content
   encoding, "exi", that can be used to indicate EXI coding in
   combination with an existing XML media type.

   This document defines a new Structured Syntax Suffix "+exi" for use
   in media types for a specific class of protocols, where the "exi"
   content-type encoding or the generic "application/exi" media type are
   not viable.  In particular, the Constrained Application Protocol
   (CoAP) [RFC7252] combines the media type and its encoding in a single
   option value.  Thus, a client would include an _Accept_ option in a
   "GET" request to indicate its capability of processing, e.g., "text/
   plain" in UTF-8 encoding, or "application/exi", while the actual
   media type and encoding of a transferred payload would be described
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