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xCard: vCard XML Representation
RFC 6351

Internet Engineering Task Force (IETF)                      S. Perreault
Request for Comments: 6351                                      Viagenie
Category: Standards Track                                    August 2011
ISSN: 2070-1721

                    xCard: vCard XML Representation

Abstract

   This document defines the XML schema of the vCard data format.

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/rfc6351.

Copyright Notice

   Copyright (c) 2011 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.

Perreault                    Standards Track                    [Page 1]
RFC 6351                          xCard                      August 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  2
   3.  The Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  2
   4.  Example: Author's XML vCard  . . . . . . . . . . . . . . . . .  3
   5.  Design Considerations  . . . . . . . . . . . . . . . . . . . .  4
     5.1.  Extensibility  . . . . . . . . . . . . . . . . . . . . . .  6
     5.2.  Limitations  . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Format Conversions . . . . . . . . . . . . . . . . . . . . . .  8
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Registration of the XML Namespace  . . . . . . . . . . . . 11
     8.2.  Media Type . . . . . . . . . . . . . . . . . . . . . . . . 11
   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 12
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 12
     10.2. Informative References . . . . . . . . . . . . . . . . . . 13
   Appendix A.  Relax NG Schema . . . . . . . . . . . . . . . . . . . 14

1.  Introduction

   vCard [RFC6350] is a data format for representing and exchanging
   information about individuals and other entities.  It is a text-based
   format (as opposed to a binary format).  This document defines xCard,
   an XML [W3C.REC-xml-20081126] representation for vCard.  The
   underlying data structure is exactly the same, enabling a 1-to-1
   mapping between the original vCard format and the XML representation.
   The XML formatting may be preferred in some contexts where an XML
   engine is readily available and may be reused instead of writing a
   standalone vCard parser.

   Earlier work on an XML format for vCard was started in 1998 by Frank
   Dawson [VCARD-DTD].  Sadly, it did not take over the world.

2.  Conventions

   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].

3.  The Schema

   The schema is expressed in the RELAX NG language [ISO.19757-2.2008]
   and is found in Appendix A.

Perreault                    Standards Track                    [Page 2]
RFC 6351                          xCard                      August 2011

4.  Example: Author's XML vCard

   <?xml version="1.0" encoding="UTF-8"?>
   <vcards xmlns="urn:ietf:params:xml:ns:vcard-4.0">
     <vcard>
       <fn><text>Simon Perreault</text></fn>
       <n>
         <surname>Perreault</surname>

[include full document text]