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 . 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. 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 To: 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 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]. 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 [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 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 " Because XHTML+Voice is in the XHTML family of languages, the root element of an XHTML+Voice document is 'html', and '