This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
3.27 log
|
Element type |
log (2.0) |
|
Attributes |
expr | label |
|
Parents |
block | catch | error | filled | help | if | noinput | nomatch |
|
Children |
PCDATA | value |
|
Description |
When the interpreter encounters this element, it will write a message to its log. The message will consist either of the contents of this element or of the evaluation of the expr attribute. Developers can use log to trace the execution of their VoiceXML programs. |
DTD
<!ELEMENT log (#PCDATA | value)* > <!ATTLIST log label CDATA #IMPLIED expr %expression; #IMPLIED >
Language model
Attributes
-
expr : expression
An optional ECMAScript expression evaluating to string whose value is to be written to the log file.
-
label : CDATA
Indicates the category for this log message. This is useful when sifting through lengthy log files.
Children
-
PCDATA or value elements
To be written to the log file.
Examples
Example 3-31 Application that produces logging data
<?xml version="1.0" encoding="iso-8859-1"?>
<vxml version="2.0">
<form id="test">
<field name="ssno" type="digits">
<prompt>
Please enter your social security number.
</prompt>
<filled>
<if cond="ssno.length!=9">
<prompt>
I'm sorry. That is not a valid social security number.
</prompt>
<log label="user_error">
Bad SS#: <value expr="ssno"/>
</log>
<clear namelist="ssno"/>
<reprompt/>
</if>
</filled>
</field>
</form>
</vxml>