Network Working Group G. McCobb
Request for Comments: 4374 IBM Corporation
Category: Informational January 2006
The application/xv+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 (2006).
Abstract
This document describes the registration of the MIME sub-type
application/xv+xml. This sub-type is intended for use as a media
descriptor for XHTML+Voice multimodal language documents.
1. Introduction
XHTML+Voice is a member of the XHTML family of document types, as
specified by XHTML Modularization [4]. XHTML+Voice extends XHTML 1.1
[5] with a modularized subset of VoiceXML 2.0 [9], XML Events [7],
and a few extensions to both XHTML and VoiceXML 2.0. XHTML 1.1,
VoiceXML 2.0, and XML Events are W3C Recommendations.
The language integration defined by XHTML+Voice supports all modules
defined by XHTML Modularization and adds voice interaction to XHTML
elements in order to enable multimodal applications. The defined
document type for XHTML+Voice is XHTML Host language document type
conformant.
XHTML+Voice 1.2 [8] is maintained by the VoiceXML Forum, at URI
location <http://www.voicexml.org/specs/multimodal/x+v/12/>.
1.1. application/xv+xml Usage
The application/xv+xml media type is intended to be a media
descriptor for XHTML+Voice multimodal documents. It is used to
inform applications that additional markup for running a voice
browser component and activating handlers for DOM Level 2 events [6]
via XML Events [7] can be processed.
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RFC 4374 The application/xv+xml Media Type January 2006
This media type registration is not intended for e-mail usage.
2. IANA Registration
To: ietf-types@iana.org
Subject: Registration of MIME media type
application/xv+xml
MIME media type name: application
MIME subtype name: xv+xml
Required parameters: none
Optional parameters:
charset: has the same semantics as the charset parameter of the
"application/xml" media type specified in [1].
Encoding considerations:
XHTML+Voice has the same media type encoding considerations
specified in Section 3.2 of [1].
Security considerations:
XHTML+Voice is an extension of XHTML and has the same security
issues as XHTML. These include interpreting anchors and forms in
XHTML documents, and scripting languages and other dynamic
interactive capabilities. See Section 7 of [2].
In addition, the scripting language can be accessed by both the
XHTML and the VoiceXML 2.0 markup embedded in the XHTML+Voice
document. See Section 1.3.1.5 of [8].
XML-Events [7] allows an author to attach a handler to any node in
the document. The handler that is activated in response to a
specified event may be either a voice dialog or a script that can
be in either the same or an external document.
Interoperability considerations:
Because XHTML+Voice is built upon W3C standard recommendations, it
is designed to be interoperable across a wide range of platforms
and client devices. Because the extensions to XHTML are
identified by their namespaces, all browsers that have namespace
support can run an XHTML+Voice document as an XHTML document
without voice interaction.
Published specification:
The latest published version of XHTML+Voice is [8].
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RFC 4374 The application/xv+xml Media Type January 2006
Applications which use this media type:
XHTML+Voice documents are intended to be deployed on the World
Wide Web and rendered by multimodal browsers that support the
visual and voice modes of interaction. Because XHTML+Voice is an
application of XML, authors can expect XHTML+Voice user agents to
be conformant XML 1.0 [3] processors. See section 2 of [2].
Additional information:
Magic number(s): There is no single string that is always present.
File extension(s): mxml, xhvml, xvml, xvm
Macintosh File Type Code(s): TEXT
Person & e-mail address to contact for further information:
Gerald McCobb
mccobb@us.ibm.com
Intended usage: LIMITED USE
Author/Change controller: Gerald McCobb
Further information:
3. Fragment Identifiers
See Section 3 of [2]. Following [2], fragment identifiers for XHTML+
Voice documents designate the element with the corresponding ID
attribute value (see [3], Section 3.3.1).
While XHTML+Voice adds new ID attributes with fragment identifier
namespaces that are not in the same namespace as XHTML, uniqueness of
the ID attribute values is preserved within the document. See
sections 1.3.1 and 5.3 of [8].
4. Recognizing XHTML+Voice files
Because XHTML+Voice is XML, an XHTML+Voice document (optionally)
starts with an XML declaration that begins with "<?xml" and has a
DOCTYPE declaration "<!DOCTYPE html". XHTML+Voice 1.2 has the
following DOCTYPE declaration:
<!DOCTYPE html PUBLIC "-//VoiceXML Forum//DTD XHTML+Voice 1.2//EN"
"http://www.voicexml.org/specs/multimodal/x+v/12/dtd/xhtml+voice12.dtd">
Because XHTML+Voice is in the XHTML family of languages, the root
element of an XHTML+Voice document is 'html', and '<html' can be
found near the top of the document.
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RFC 4374 The application/xv+xml Media Type January 2006
5. Security Considerations
Security considerations for this media type are discussed in the MIME
type registration that appears in Section 2.
6. IANA Considerations
As described in Section 2, this document specifies the registration
of a MIME type for XHTML+Voice documents according to [1].
7. Normative References
[1] Murata, M., St. Laurent, S., and D. Kohn, "XML Media Types",
RFC 3023, January 2001.
[2] Baker, M. and P. Stark, "The 'application/xhtml+xml' Media
Type", RFC 3236, January 2002.
[3] Bray, T. and others, "Extensible Markup Language (XML) 1.0", W3C
Recommendation, http://www.w3.org/TR/REC-xml", February 2004.
[4] Dooley, S. and others, "Modularization of XHTML", W3C
Recommendation, http://www.w3.org/TR/xhtml-modularization",
April 2001.
[5] Altheim, M. and S. McCarron, "XHTML 1.1 - Module-based XHTML",
W3C Recommendation, http://www.w3.org/TR/xhtml11/, May 2001.
[6] Pixley, T., "Document Object Model Level 2 Events
Specification", W3C Recommendation,
http://www.w3.org/TR/DOM-Level-2-Events/, November 2000.
[7] Pemberton, S., Raman, T., and S. McCarron, "XML Events - An
events syntax for XML", W3C Recommendation,
http://www.w3.org/TR/xml-events/, January 2002.
[8] Axelsson, J. and others, "XHTML+Voice Profile 1.2",
http://www.voicexml.org/specs/multimodal/x+v/12/, March 2004.
[9] McGlashan, S. and others, "Voice Extensible Markup Language
(VoiceXML)", W3C Recommendation,
http://www.w3.org/TR/voicexml20/, March 2004.
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RFC 4374 The application/xv+xml Media Type January 2006
Author's Address
Gerald McCobb
International Business Machines Corporation
8051 Congress Ave.
Boca Raton, FL 33487
USA
Phone: +1 561 862 2109
EMail: mccobb@us.ibm.com
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RFC 4374 The application/xv+xml Media Type January 2006
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Acknowledgement
Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA).
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