Voice XML: Chapter 12 Exercises

VoiceXML: Introduction to Developing
Speech Applications

12-1 Identify two VoiceXML interpreter venders. (See the companion web site for a partial list of candidate venders.) Review their web sites and construct a table that compares the two venders with respect to audio files, grammars, subdialogs, objects, applications and services and underlying technologies including TTS, ASR, barge-in, DTMS recognition, etc. Based solely on the available of reusable components, which vender to you recommend?

12-2 Convert the VoiceXML program you wrote for Exercise 10-1 into a reusable subdialog.

A. Demonstrate your subdialog by referencing it from another VoiceXML application

<?xml version="1.0"?> <!DOCTYPE vxml PUBLIC "-//BeVocal Inc//VoiceXML 2.0//EN" "http://cafe.bevocal.com/libraries/dtd/vxml2-0-bevocal.dtd"> <vxml version="2.0" xmlns = "http://www.w3.org/2001/vxml"> <!-- Exercise 12.2 A subdialog --> <form id="main"> <block>We're about to call the sub dialog</block> <subdialog name="result" src="#job_application_form"> </subdialog> <block> <prompt> We're back from the sub dialog. </prompt> </block> </form> <form id = "job_application_form"> <!-- This is the subdialog --> <!-- Variables are given values by parameters to the subdialog --> <block> <prompt> Welcome to the job application form </prompt> </block> <field name = "name"> <prompt> What is your name? </prompt> <grammar type = "application/grammar+xml" root = "applicant_name"> <rule id = "applicant_name"> <one-of> <item> sam </item> <item> fred </item> </one-of> </rule> </grammar> </field> <field name = "age"> <prompt> How old are you? </prompt> <grammar type = "application/grammar+xml" root = "applicant_age"> <rule id = "applicant_age"> <one-of> <item> twenty </item> <item> thirty </item> </one-of> </rule> </grammar> </field> <filled> <prompt> Your name is <value expr = "name"/> Your age is <value expr = "age"/> Good Bye </prompt> <return/> </filled> </form> </vxml>

B. Redesign your subdialog so that another developer can change the prompt messages without changing your subdialog code.

<?xml version="1.0"?> <!DOCTYPE vxml PUBLIC "-//BeVocal Inc//VoiceXML 2.0//EN" "http://cafe.bevocal.com/libraries/dtd/vxml2-0-bevocal.dtd"> <vxml version="2.0" xmlns = "http://www.w3.org/2001/vxml"> <!-- Exercise 12.2 B subdialog --> <form id="main"> <block>We're about to call the sub dialog</block> <subdialog name="result" src="#job_application_form"> <param name = "name_prompt" value = "name, please"/> <param name = "age_prompt" value = "age, please"/> </subdialog> <block> <prompt> We're back from the sub dialog. </prompt> </block> </form> <form id = "job_application_form"> <!-- This is the subdialog --> <!-- Variables are given values by parameters to the subdialog --> <var name="name_prompt" expr = "prompt1"/> <var name="age_prompt" expr = "prompt2"/> <block> <prompt> Welcome to the job application form </prompt> </block> <field name = "name"> <prompt> <value expr = "name_prompt"/> </prompt> <grammar type = "application/grammar+xml" root = "applicant_name"> <rule id = "applicant_name"> <one-of> <item> sam </item> <item> fred </item> </one-of> </rule> </grammar> </field> <field name = "age"> <prompt> <value expr = "age_prompt"/> </prompt> <grammar type = "application/grammar+xml" root = "applicant_age"> <rule id = "applicant_age"> <one-of> <item> twenty </item> <item> thirty </item> </one-of> </rule> </grammar> </field> <filled> <prompt> Your name is <value expr = "name"/> Your age is <value expr = "age"/> Good Bye </prompt> <return/> </filled> </form> </vxml>

C. Redesign your subdialog so that another developer can change the grammar used by menus and fields without changing your subdialog code.

<?xml version="1.0"?> <!DOCTYPE vxml PUBLIC "-//BeVocal Inc//VoiceXML 2.0//EN" "http://cafe.bevocal.com/libraries/dtd/vxml2-0-bevocal.dtd"> <vxml version="2.0" xmlns = "http://www.w3.org/2001/vxml"> <!-- Exercise 12.2 c subdialog --> <form id="main"> <block>We're about to call the sub dialog</block> <subdialog name="result" src="#job_application_form"> <param name = "name_prompt" value = "name, please"/> <param name = "age_prompt" value = "age, please"/> </subdialog> <block> <prompt> We're back from the sub dialog. </prompt> </block> </form> <form id = "job_application_form"> <!-- This is the subdialog --> <!-- Variables are given values by parameters to the subdialog --> <var name="name_prompt" expr = "prompt1"/> <var name="age_prompt" expr = "prompt2"/> <block> <prompt> Welcome to the job application form </prompt> </block> <field name = "name"> <prompt> <value expr = "name_prompt"/> </prompt> <grammar type = "application/grammar+xml" src="name1.grxml"/> </field> <field name = "age"> <prompt> <value expr = "age_prompt"/> </prompt> <grammar type = "application/grammar+xml" root = "applicant_age"> <rule id = "applicant_age"> <one-of> <item> twenty </item> <item> thirty </item> </one-of> </rule> </grammar> </field> <filled> <prompt> Your name is <value expr = "name"/> Your age is <value expr = "age"/> Good Bye </prompt> <return/> </filled> </form> </vxml>

Using the following grammar: name1.grxml:

<grammar type="application/grammar+xml" version="1.0" xml:lang = "en" root="first_name"> <rule id = "first_name" scope = "public"> <one-of> <item>abe</item> <item>bob</item> <item>charles</item> <item>dan</item> <item>evan</item> </one-of> </rule> </grammar>

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