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November
/ December 2002 Features
ARTICLE
ONE
Enhancing
VoiceXML Application Performance By Caching
By
David Burke
The
VoiceXML architectural model specifies a partitioning
of application hosting, and application rendering (figure
1). Specifically, the application is served from a Web
Server and is typically created dynamically within the
framework of an Application Server or equivalent. The
VoiceXML Interpreter renders the resultant VoiceXML
document, transmitted across a network by HTTP, into
a series of instructions interpreted by the Implementation
Platform. Implied in this model is a geographical distribution
of the application hosting environment and the VoiceXML
platform and thus the incursion of network latencies.
An application might make many subsequent requests for
new VoiceXML documents during its lifetime and thus
these latencies may have considerable adverse effects
on performance. In this article we will discuss how
caching can be used to enhance the performance of VoiceXML
applications. Caching is a strategy for storing temporary
'objects' (e.g. VoiceXML resources) local to the VoiceXML
Interpreter that can be employed by the application
developer for optimising these latencies. In what follows
we will use the phrase 'origin server' to denote the
application hosting environment, and 'user agent' to
refer to the VoiceXML Interpreter and Implementation
Platform.
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ARTICLE
TWO
Standardizing
VoiceXML Generation Tools
By
David L. Thomson
An
area where we have an opportunity to make VoiceXML easier
to use and more portable is in development and runtime
tools. VoiceXML provides two significant advantages
in authoring speech-enabled applications, when compared
to previous methods. It allows a developer to build
speech services with less effort and it allows applications
written for one speech platform to run on another speech
platform. These advantages are diminished, however,
if software tools used to create and support VoiceXML
code are inadequate or incompatible. The VoiceXML Tools
Committee, under the direction of the VoiceXML Forum,
has been working on methods for improving the quality
and uniformity of tools as described below.
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Copyright
© 2001 VoiceXML Forum. All rights reserved.
The VoiceXML Forum is a program of the
IEEE Industry Standards
and Technology Organization (IEEE-ISTO).
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