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rfc:rfc3902

Network Working Group M. Baker Request for Comments: 3902 Independent Category: Informational M. Nottingham

                                                           BEA Systems
                                                        September 2004
               The "application/soap+xml" media type

Status of this Memo

 This memo provides information for the Internet community.  It does
 not specify an Internet standard of any kind.  Distribution of this
 memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (2004).

Abstract

 This document defines the "application/soap+xml" media type which can
 be used to describe SOAP 1.2 messages serialized as XML 1.0.

1. Introduction

 SOAP version 1.2 (SOAP) is a lightweight protocol intended for
 exchange of structured information between peers in a decentralized,
 distributed environment.  It defines an extensible messaging
 framework that contains a message construct based on XML technologies
 that can be exchanged over a variety of underlying protocols.
 This specification defines the media type "application/soap+xml"
 which can be used to identify SOAP 1.2 message envelopes that have
 been serialized with XML 1.0.  Such serializations are useful as the
 basis of "wire formats" for SOAP 1.2 Protocol Binding Specifications
 [W3C.REC-soap12-part1-20030624], or in other situations where an XML
 serialization of a SOAP envelope is required.
 The "application/soap+xml" media type explicitly identifies SOAP 1.2
 message envelopes that have been serialised with XML 1.0; message
 envelopes with a different SOAP namespace version or using another
 XML serialisation MUST NOT use it.
 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
 document are to be interpreted as described in [RFC2119].

Baker & Nottingham Informational [Page 1] RFC 3902 The "application/soap+xml" media type September 2004

2. Registration

 MIME media type name: application
 MIME subtype name: soap+xml
 Required parameters: none
 Optional parameters:
    "charset": This parameter has identical semantics to the charset
       parameter of the "application/xml" media type as specified in
       RFC 3023 [RFC3023].
    "action": This optional parameter can be used to specify the URI
       that identifies the intent of the message.  In SOAP 1.2, it
       serves a similar purpose as the SOAPAction HTTP header field
       did in SOAP 1.1.  Namely, its value identifies the intent of
       the message.
       The value of the action parameter is an absolute URI-reference
       as defined by RFC 2396 [RFC2396], which MUST be non-empty.
       SOAP places no restrictions on the specificity of the URI or
       that it is resolvable.  Although the purpose of the action
       parameter is to indicate the intent of the SOAP message there
       is no mechanism for automatically computing the value based on
       the SOAP envelope.  In other words, the value has to be
       determined out of band.  It is recommended that the same value
       be used to identify sets of message types that are logically
       connected in some manner, for example part of the same
       "service".  It is strongly RECOMMENDED that the URI be globally
       unique and stable over time.
       Use of the action parameter is OPTIONAL.  SOAP Receivers MAY
       use it as a hint to optimize processing, but SHOULD NOT require
       its presence in order to operate.
 Encoding considerations: Identical to those of "application/xml" as
    described in RFC 3023 [RFC3023], section 3.2, as applied to the
    SOAP envelope infoset.
 Security considerations: Because SOAP can carry application defined
    data whose semantics is independent from that of any MIME wrapper
    (or context within which the MIME wrapper is used), one should not
    expect to be able to understand the semantics of the SOAP message
    based on the semantics of the MIME wrapper alone.  Therefore,
    whenever using the "application/soap+xml" media type, it is
    strongly RECOMMENDED that the security implications of the context
    within which the SOAP message is used is fully understood.  The
    security implications are likely to involve both the specific SOAP
    binding to an underlying protocol as well as the application-

Baker & Nottingham Informational [Page 2] RFC 3902 The "application/soap+xml" media type September 2004

    defined semantics of the data carried in the SOAP message (though
    one must be careful when doing this, as discussed in SOAP 1.2 Part
    1 [W3C.REC-soap12-part1-20030624], section Binding to
    Application-Specific Protocols).
    Also, see SOAP 1.2 Part 1 [W3C.REC-soap12-part1-20030624], the
    entire section Security Considerations.
    In addition, as this media type uses the "+xml" convention, it
    shares the same security considerations as described in RFC 3023
    [RFC3023], section 10.
    The action parameter is not a security mechanism, and SHOULD NOT
    be used for authentication.  If the action parameter is used to
    make decisions (e.g., dispatch, filtering), it is RECOMMENDED that
    the basis for such decisions should be confirmed by examining the
    SOAP Envelope.
 Interoperability considerations: There are no known interoperability
    issues.
 Published specification: SOAP 1.2 Part 1
    [W3C.REC-soap12-part1-20030624] and SOAP 1.2 Part 2
    [W3C.REC-soap12-part2-20030624].
 Applications which use this media type: Various SOAP 1.2 conformant
    toolkits use this media type.
 Additional information:
 File extension: SOAP messages are not required or expected to be
    stored as files.
 Fragment identifiers: Identical to that of "application/xml" as
    described in RFC 3023 [RFC3023], section 5.
 Base URI: As specified in RFC 3023 [RFC3023], section 6.  Also see
    SOAP 1.2 Part 1 [W3C.REC-soap12-part1-20030624], section Use of
    URIs in SOAP.
 Macintosh File Type code: TEXT
 Person and email address to contact for further information:
    World Wide Web Consortium <web-human@w3.org>
 Intended usage: COMMON
 Author/Change controller: The SOAP 1.2 specification set is a work
    product of the World Wide Web Consortium's XML Protocol Working
    Group.  The W3C has change control over these specifications.

3. Security Considerations

 See the "Security Considerations" section of the registration
 template found in Section 2.

Baker & Nottingham Informational [Page 3] RFC 3902 The "application/soap+xml" media type September 2004

4. Normative References

 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC2396]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
            Resource Identifiers (URI): Generic Syntax", RFC 2396,
            August 1998.
 [RFC3023]  Murata, M., St.Laurent, S., and D. Kohn, "XML Media
            Types", RFC 3023, January 2001.
 [W3C.REC-soap12-part1-20030624]
            Hadley, M., Mendelsohn, N., Moreau, J., Nielsen, H., and
            M.  Gudgin, "SOAP Version 1.2 Part 1: Messaging
            Framework", W3C REC REC-soap12-part1-20030624, June 2003.
 [W3C.REC-soap12-part2-20030624]
            Moreau, J., Nielsen, H., Gudgin, M., Hadley, M., and N.
            Mendelsohn, "SOAP Version 1.2 Part 2: Adjuncts", W3C REC
            REC-soap12-part2-20030624, June 2003.

5. Authors' Addresses

 Mark A. Baker
 Independent
 37 Charles St.
 Ottawa, Ontario  K1M 1R3
 CA
 EMail: distobj@acm.org
 Mark Nottingham
 BEA Systems
 235 Montgomery St., Level 15
 San Francisco, CA  94010
 US
 EMail: mnot@pobox.com

Baker & Nottingham Informational [Page 4] RFC 3902 The "application/soap+xml" media type September 2004

6. Full Copyright Statement

 Copyright (C) The Internet Society (2004).
 This document is subject to the rights, licenses and restrictions
 contained in BCP 78, and at www.rfc-editor.org, and except as set
 forth therein, the authors retain all their rights.
 This document and the information contained herein are provided on an
 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/S HE
 REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE
 INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
 THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

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 Intellectual Property Rights or other rights that might be claimed to
 pertain to the implementation or use of the technology described in
 this document or the extent to which any license under such rights
 might or might not be available; nor does it represent that it has
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 Copies of IPR disclosures made to the IETF Secretariat and any
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 http://www.ietf.org/ipr.
 The IETF invites any interested party to bring to its attention any
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Acknowledgement

 Funding for the RFC Editor function is currently provided by the
 Internet Society.

Baker & Nottingham Informational [Page 5]

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