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The Metalink Download Description Format
RFC 5854

Internet Engineering Task Force (IETF)                          A. Bryan
Request for Comments: 5854                                  T. Tsujikawa
Category: Standards Track                                       N. McNab
ISSN: 2070-1721
                                                                P. Poeml
                                                             MirrorBrain
                                                               June 2010

                The Metalink Download Description Format

Abstract

   This document specifies Metalink, an XML-based download description
   format.  Metalink describes download locations (mirrors),
   cryptographic hashes, and other information.  Clients can
   transparently use this information to reliably transfer files.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5854.

Copyright Notice

   Copyright (c) 2010 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.

Bryan, et al.                Standards Track                    [Page 1]
RFC 5854          Metalink Download Description Format         June 2010

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Examples . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Namespace and Version  . . . . . . . . . . . . . . . . . .  5
     1.3.  Notational Conventions . . . . . . . . . . . . . . . . . .  5
   2.  Metalink Documents . . . . . . . . . . . . . . . . . . . . . .  6
   3.  Common Metalink Constructs . . . . . . . . . . . . . . . . . .  7
     3.1.  Text Constructs  . . . . . . . . . . . . . . . . . . . . .  7
     3.2.  Date Constructs  . . . . . . . . . . . . . . . . . . . . .  8
   4.  Metalink Element Definitions . . . . . . . . . . . . . . . . .  8
     4.1.  Container Elements . . . . . . . . . . . . . . . . . . . .  8
       4.1.1.  The "metalink:metalink" Element  . . . . . . . . . . .  8
       4.1.2.  The "metalink:file" Element  . . . . . . . . . . . . .  9
       4.1.3.  The "metalink:pieces" Element  . . . . . . . . . . . . 12
     4.2.  Metadata Elements  . . . . . . . . . . . . . . . . . . . . 12
       4.2.1.  The "metalink:copyright" Element . . . . . . . . . . . 12
       4.2.2.  The "metalink:description" Element . . . . . . . . . . 13
       4.2.3.  The "metalink:generator" Element . . . . . . . . . . . 13
       4.2.4.  The "metalink:hash" Element  . . . . . . . . . . . . . 14
       4.2.5.  The "metalink:identity" Element  . . . . . . . . . . . 15
       4.2.6.  The "metalink:language" Element  . . . . . . . . . . . 15
       4.2.7.  The "metalink:logo" Element  . . . . . . . . . . . . . 16
       4.2.8.  The "metalink:metaurl" Element . . . . . . . . . . . . 16
       4.2.9.  The "metalink:origin" Element  . . . . . . . . . . . . 18
       4.2.10. The "metalink:os" Element  . . . . . . . . . . . . . . 18
       4.2.11. The "metalink:published" Element . . . . . . . . . . . 18
       4.2.12. The "metalink:publisher" Element . . . . . . . . . . . 18
       4.2.13. The "metalink:signature" Element . . . . . . . . . . . 19
       4.2.14. The "metalink:size" Element  . . . . . . . . . . . . . 20
       4.2.15. The "metalink:updated" Element . . . . . . . . . . . . 20
       4.2.16. The "metalink:url" Element . . . . . . . . . . . . . . 20
       4.2.17. The "metalink:version" Element . . . . . . . . . . . . 21
   5.  Extending Metalink . . . . . . . . . . . . . . . . . . . . . . 21
     5.1.  Extensions from Non-Metalink Vocabularies  . . . . . . . . 21
     5.2.  Extensions to the Metalink Vocabulary  . . . . . . . . . . 21

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