Select an activity that uses expressions, such as the assign, wait, or on alarm branch of a pick activity.

In the Properties view for the activity, select the appropriate property. For example, in an assign activity, select Copy Operations, and select Expression as a Copy/From type to display the following dialog:

Select the variables, functions and operators from the three boxes to build an expression, following these tips:

Build expressions faster with shortcuts. See
Using Content Assist
.
Expand a variable to see and use the parts and properties. For detailed descriptions of variables, see
Using Variables
.
Select a variable, part, function, or operator and select
Insert
For working with variable attachments, see
Custom Functions for Manipulating Attachments
.
Add your own custom functions, as described in
Creating POJO and XQuery Custom Functions
.

Select

Evaluate

to substitute a sample value for a variable part and simplify the expression to view its value.