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 (C) The Internet Society (2006).
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.
XHTML+Voice is a member of the XHTML family of document types, as
specified by XHTML Modularization . XHTML+Voice extends XHTML 1.1
 with a modularized subset of VoiceXML 2.0 , XML Events ,
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
XHTML+Voice 1.2  is maintained by the VoiceXML Forum, at URI
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 
via XML Events  can be processed.
McCobb Informational [Page 1]RFC 4374 The application/xv+xml Media Type January 2006
This media type registration is not intended for e-mail usage.
2. IANA Registration
Subject: Registration of MIME media type
MIME media type name: application
MIME subtype name: xv+xml
Required parameters: none
charset: has the same semantics as the charset parameter of the
"application/xml" media type specified in .
XHTML+Voice has the same media type encoding considerations
specified in Section 3.2 of .
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 .
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 18.104.22.168 of .
XML-Events  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.
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.
The latest published version of XHTML+Voice is .
McCobb Informational [Page 2]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  processors. See section 2 of .
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:
Intended usage: LIMITED USE
Author/Change controller: Gerald McCobb