W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > August 2002

Pls Review: New Media Type Draft

From: Aaron Swartz <me@aaronsw.com>
Date: Fri, 23 Aug 2002 11:34:19 -0500
To: RDF Core <w3c-rdfcore-wg@w3.org>
Message-Id: <2C512119-B6B6-11D6-AC9C-003065F376B6@aaronsw.com>

Changes:
  - removed "as described in RFC3023 or any version that supercedes it."
  - added section 4, social context
Please review quickly, the previous draft expires at the end of the 
month. I'd like to get this one published by then.

Text: 
http://www.aaronsw.com/2002/draft-w3c-rdfcore-rdfxml-mediatype-01.txt
HTML: 
http://www.aaronsw.com/2002/draft-w3c-rdfcore-rdfxml-mediatype-01.html
XML: 
http://www.aaronsw.com/2002/draft-w3c-rdfcore-rdfxml-mediatype-01.xml




Network Working Group                                          A. Swartz
Internet-Draft                                               AaronSw.com
Expires: February 21, 2003                               August 23, 2002


               application/rdf+xml Media Type Registration
                  draft-w3c-rdfcore-rdfxml-mediatype-01

Status of this Memo

    This document is an Internet-Draft and is in full conformance with
    all provisions of Section 10 of RFC2026.

    Internet-Drafts are working documents of the Internet Engineering
    Task Force (IETF), its areas, and its working groups.  Note that
    other groups may also distribute working documents as Internet-
    Drafts.

    Internet-Drafts are draft documents valid for a maximum of six months
    and may be updated, replaced, or obsoleted by other documents at any
    time.  It is inappropriate to use Internet-Drafts as reference
    material or to cite them other than as "work in progress."

    The list of current Internet-Drafts can be accessed at http://
    www.ietf.org/ietf/1id-abstracts.txt.

    The list of Internet-Draft Shadow Directories can be accessed at
    http://www.ietf.org/shadow.html.

    This Internet-Draft will expire on February 21, 2003.

Copyright Notice

    Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

    This document describes a media type (application/rdf+xml) for use
    with the XML serialization of the Resource Description Framework
    (RDF).  RDF is a language designed to support the Semantic Web, by
    facilitating resource description and data exchange on the Web.  RDF
    provides common structures that can be used for interoperable data
    exchange and follows the World Wide Web Consortium (W3C) design
    principles of interoperability, evolution, and decentralization.








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Table of Contents

    1. Discussion of this Document  . . . . . . . . . . . . . . . . . . 3
    2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
    3. application/rdf+xml Registration . . . . . . . . . . . . . . . . 3
    4. Social Context . . . . . . . . . . . . . . . . . . . . . . . . . 5
    5. Fragment Identifiers . . . . . . . . . . . . . . . . . . . . . . 5
    6. Historical Considerations  . . . . . . . . . . . . . . . . . . . 5
    7. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . . 6
    8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 6
       References . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
       Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7
       Full Copyright Statement . . . . . . . . . . . . . . . . . . . . 8






































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1. Discussion of this Document

    Please send comments to <mailto:www-rdf-comments@w3.org>.  To
    subscribe, send a message with the body 'subscribe' to <mailto:www-
    rdf-comments-request@w3.org>.  The mailing list is publically
    archived at <http://lists.w3.org/Archives/Public/www-rdf-comments/>.

2. Introduction

    RDF is a language designed to support the Semantic Web, by
    facilitating resource description and data exchange on the Web.  RDF
    provides common structures that can be used for interoperable data
    exchange and follows the W3C design principles of interoperability,
    evolution, and decentralization.

    While the RDF data model [2] can be serialized in many ways, the W3C
    has defined the RDF/XML syntax [1] to allow RDF to be serialized in
    an XML format.  The application/rdf+xml media type allows RDF
    consumers to identify RDF/XML documents so that they can be processed
    properly.

3. application/rdf+xml Registration

    This is a media type registration as defined in Multipurpose Internet
    Mail Extensions (MIME) Part Four: Registration Procedures [6]

       MIME media type name: application

       MIME subtype name: rdf+xml

       Required parameters: none

       Optional parameters: charset

          Same as charset parameter of application/xml.

       Encoding considerations:

          Same as charset parameter of application/xml.

       Security considerations:

          Security considerations include many of those described in
          section 10 of RFC 3023 [4] and more, due to the semantic nature
          of RDF.  RDF documents may make assertions about anything and
          it is expected that future work with Digital Signature and "Web
          of Trust" will make it more clear how to build secure RDF
          systems.



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       Interoperability considerations:

          It is recommended that RDF documents follow the newer RDF/XML
          Syntax Grammar [1] as opposed to the older RDF Model and Syntax
          specification [3].

       Published specification: see RDF/XML Syntax Grammar [1] and RDF
       Model Theory [2] (working drafts as of 2002-03) and the older RDF
       Model and Syntax [3]

       Applications which use this media type:

          RDF is device-, platform-, and vendor-neutral and is supported
          by a range of Web user agents and authoring tools.

       Additional information:

          Magic number(s): none

             Although no byte sequences can be counted on to consistently
             identify RDF, RDF documents will have the sequence "http://
             www.w3.org/1999/02/22-rdf-syntax-ns#" to identify the RDF
             namespace.  This will usually be towards the top of the
             document.

          File extension(s): .rdf

          Macintosh File Type Code(s): "TEXT"

       For further information:

          Dan Brickley <danbri@w3.org>

          RDF Interest Group <www-rdf-interest@w3.org>

          More information may be found on the RDF website: <http://
          www.w3.org/RDF/>

       Intended usage: COMMON

       Author/Change controller:

          The RDF specification is a work product of the World Wide Web
          Consortium.  The W3C and the W3C RDF Core Working Group have
          change control over the specification.






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4. Social Context

    RDF/XML documents may be asserted to be true, and such an assertion
    should be understood to carry the same social import and
    responsibilities as an assertion in any other format.  A combination
    of social (e.g.  legal) and technical machinery (protocols, file
    formats, publication frameworks) provide the contexts that fix the
    intended meanings of the vocabulary of some piece of RDF, and which
    distinguish assertions from other uses (e.g.  citations, denals or
    illustrations).

    RDF/XML documents with this media type might be published with the
    intent of being such an assertional representation (as distinguished
    from other XML or text that may just happen to look like RDF
    assertions).

5. Fragment Identifiers

    Section 4.1 of the URI specification [5] notes that the semantics of
    a fragment identifier (part of a URI after a "#") is a property of
    the data resulting from a retrieval action, and that the format and
    interpretation of fragment identifiers is dependent on the media type
    of the retrieval result.

    However, in RDF, the thing identified by a URI with fragment
    identifier does not bear any particular relationship to the thing
    identified by the URI alone.  This differs from some readings of the
    URI specification [5], so attention is recommended when creating new
    RDF terms which use fragment identifiers.

    The rdf:ID and rdf:about attributes can be used to define fragments
    in an RDF document.

6. Historical Considerations

    This media type was reserved in RFC 3023 [4], saying:

       RDF documents identified using this MIME type are XML documents
       whose content describes metadata, as defined by [RDF].  As a
       format based on XML, RDF documents SHOULD use the '+xml' suffix
       convention in their MIME content-type identifier.  However, no
       content type has yet been registered for RDF and so this media
       type should not be used until such registration has been
       completed.







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7. IANA Considerations

    This document calls for registration of a new MIME content-type,
    according to the registration template in section 2.

8. Acknowledgements

    Thanks to Dan Connolly for writing the first version of this draft
    [8], to Andy Powell for reminding us we needed one, to Marshall Rose
    for his xml2rfc [9] converter, and to Graham Klyne, Jan Grant and
    Dave Beckett for their helpful comments on early versions of this
    document.

References

    [1]  Beckett, D., "RDF/XML Syntax Specification (Revised)", W3C rdf-
         syntax-grammar, March 2002, <http://www.w3.org/TR/rdf-syntax-
         grammar/>.

    [2]  Hayes, P., "RDF Model Theory", W3C rdf-mt, February 2002,
         <http://www.w3.org/TR/rdf-mt/>.

    [3]  Lassila, O. and R. Swick, "Resource Description Framework (RDF)
         Model and Syntax Specification", W3C REC-rdf-syntax, February
         1999, <http://www.w3.org/TR/REC-rdf-syntax>.

    [4]  Murata, M., St.Laurent, S. and D. Kohn, "XML Media Types", RFC
         3023, January 2001.

    [5]  Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform Resource
         Identifiers (URI): Generic Syntax", RFC 2396, August 1998.

    [6]  Freed, N., Klensin, J. and J. Postel, "Multipurpose Internet
         Mail Extensions (MIME) Part Four: Registration Procedures", BCP
         13, RFC 2048, November 1996.

    [7]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
         Levels", BCP 14, RFC 2119, March 1997.

    [8]  Connolly, D., "A media type for Resource Description Framework
         (RDF)", March 2001, <http://www.w3.org/2001/03mr/rdf_mt>.

    [9]  <http://xml.resource.org/>








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Author's Address

    Aaron Swartz
    AaronSw.com
    349 Marshman
    Highland Park, IL  60035
    USA

    Phone: +1 847 432 8857
    EMail: me@aaronsw.com
    URI:   http://www.aaronsw.com/








































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Full Copyright Statement

    Copyright (C) The Internet Society (2002).  All Rights Reserved.

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Acknowledgement

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



















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Received on Friday, 23 August 2002 12:34:23 EDT

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