voicexml output of the external grammar and refill the field element - field

Question

I would like, that if the user says "help" that the following field doesn't get filled, and that the user gets all possible options.
<form id="test">
<field name="var1">
<prompt bargein="true" bargeintype="hotword" >say xy </prompt>
<grammar src = "grammar.grxml" type="application/srgs+xml" />
<filled>
<assign name="myProdukt" expr="var1" />
you said <value expr="myProdukt"/>
</filled>
</field>
(let's say in the external grammar is "p1", "p2" and "p3", the user says "help", and the systems says "p1","p2","p3" and the user can choose again - therefore the word "help" has to be in the external grammar as well, doesn't it?)
thanks in advance

Answer 1

Yes, the active grammar must contain a "help" utterance which returns the value 'help'. You then catch the event with a help tag:
<?xml version="1.0" encoding="UTF-8"?>
<vxml xmlns="http://www.w3.org/2001/vxml" version="2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3.org/2001/vxml http://www.w3.org/TR/voicexml20/vxml.xsd">
<form id="test">
<field name="var1">
<prompt bargein="true" bargeintype="hotword" >say xy </prompt>
<grammar src = "grammar.grxml" type="application/srgs+xml" />
<filled>
<assign name="myProdukt" expr="var1" />
you said <value expr="myProdukt"/>
</filled>
<help>
To choose a product, say,
<!-- whatever the product choices are -->
frobinator, submarine, curling iron, ..
<reprompt/>
</help>
</field>
</form>
</vxml>
Alternatively, following the DRY principle, this effect can be done globally for your application with using an application root document containing a link element. In the example app-root.vxml document below, there is a linkbinding a global grammar "help" utterance to the help event :
<?xml version="1.0"?>
<vxml version="2.1" xmlns="http://www.w3.org/2001/vxml">
<link event="help">
<grammar mode="voice" root="root_rule" tag-format="semantics/1.0"
type="application/srgs+xml" version="1.0" xml:lang="en-US">
<rule id="root_rule" scope="public">
<one-of>
<item weight="1.0">
help
</item>
</one-of>
</rule>
</grammar>
</link>
</vxml>
This grammar will be active everywhere -- effectively merged with each active field grammar. If you need more information about application root documents, the section of the VoiceXML specification Executing a Multi-Document Application explains. Also see Handling Events from the Tellme Studio documentation
Then, in pages of your application, make reference to the application root document via the application attribute of the vxml element and speak appropriately in a help catch block:
<?xml version="1.0" encoding="UTF-8"?>
<vxml xmlns="http://www.w3.org/2001/vxml" version="2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3.org/2001/vxml http://www.w3.org/TR/voicexml20/vxml.xsd"
application="app-root.vxml">
<form id="test">
<field name="var1">
<prompt bargein="true" bargeintype="hotword" >say xy </prompt>
<grammar src = "grammar.grxml" type="application/srgs+xml" />
<filled>
<assign name="myProdukt" expr="var1" />
you said <value expr="myProdukt"/>
</filled>
<help>
To choose a product, say,
<!-- whatever the product choices are -->
frobinator, submarine, curling iron, ..
<reprompt/>
</help>
</field>
</form>
</vxml>
You could, of course, put the link code in the same page as your form, but it is likely you will want help active for every field of your application unless there is collision with something in a particular field's grammar.