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XML without wires: XML -- relevant to both the wireless and the wired worlds. (wireless xml).

Publication: XML Journal
Publication Date: 01-APR-02 		Format: Online
Delivery: Immediate Online Access

Article Excerpt
Last month we focused on the need for compression when XML is transmitted over a wireless network (XML-J, Vol. 3, issue 3). We also looked at the use of XSLT to tailor a single XML document for display on multiple wireless devices, each of which might have different display capabilities.

This article continues the discussion of wireless XML with a look at wireless XML initiatives such as VoiceXML and WAP/WML. And we'll see how two of the hottest areas in computing -- information security and Web services -- apply to wireless XML.

Five years ago HTML's ease-of-use enabled the WorldWide Web to grow at a dramatic pace. Anybody could create a Web page and publish it for the whole world to see. The goal of the VoiceXML initiative is to bring this same ease of use to the development of voice applications, which include interactive voice response (IVR) and automated speech recognition (ASR) systems. Up until now, developing for these systems meant learning an arcane programming or scripting language.

The VoiceXML 2.0 specification was issued by the World Wide Web Consortium as a working draft on October 23, 2001 (see www.w3.or/TR/2001/ WD-voicexml20-20011023/. Real-world uses of VoiceXML include the delivery of road traffic information over telephones, and automated helpdesk systems. The developer doesn't need to worry about the underlying speech-synthesis and speech-recording technology. The VoiceXML engine takes care of that in the same way that a Web browser takes care of the rendering of HTML.

VoiceXML describes how to make audio "forms," which can be thought of as analogous to visual HTML-based forms. These audio forms play audio questions and record the user's voice responses. The interaction between the user and the VoiceXML-enabled application can proceed sequentially by...

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