Is-Null function tests if the input value is NULL.

If the input value is NULL, the function returns "true", otherwise it returns "false".

The sample below describes the syntax of the is-null-function:

 

 

<das:is-null-function id="40">

       <das:in-param id="42" src="36"/>

       <das:return-value id="41"/>

</das:is-null-function>

 

 

Attributes:

id - unique identifier of this resource in the current processing job.

 

Children elements:

<das:return-value> - specifies the id from which the result value of the function will be referenced in the current job.

<das:in-param> - specifies the source and name of the function parameter.