<param>
<param>
The <param>
element is used to specify values that are passed to subdialogs.
Attributes
Name | Data type | Description |
---|---|---|
name | String | The name to be associated with this parameter when subdialog is invoked. |
expr | String | An expression that computes the value associated with name. |
value | String | Associates a literal string value with name. |
valuetype | String | (defaults to “data”) Either data or ref; used to indicate to an object if the value associated with name is data or a URI (ref). This is not used for |
Notes
The <param>
elements of a <subdialog>
specify the parameters to pass to the subdialog. These parameters must be declared in the subdialog using <var>
elements; it is a semantic error to attempt to set a form item variable or an undeclared variable using <param>
.
When a subdialog initializes, its variables are initialized in document order to the value specified by the <param>
element with the corresponding name. The parameter values are computed by evaluating the <param>
expr attribute in the context of the <param>
element. An expr attribute in the <var>
element is ignored in this case.
If no corresponding <param>
is specified to <var>
element, an expr attribute is used as a default value, or the variable is undefined if the expr attribute is unspecified as with the regular <form>
element.
Example
The output of the above script would be:
Computer: Jane Doe, your birthdate is: February 10th, 1970. Computer: Please say your driver's license number. Human: One two three four five six seven eight nine. Computer: You entered one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine. (continues on to processing form…)
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