General
This type of placeholder can be used to access the value of a Task parameter.
Syntax
The syntax for this type of placeholder is:
Task Parameter Placeholder Syntax
[TaskParameter].[<name_of_parameter>]
Example
Let's suppose there is a Task parameter named FileName which has a value of Sales Report (a String); the following expression uses that parameter:
Expression wtih Task Parameter Placeholder
"C:\Reports\" & [TaskParameter].[FileName]
This expression will return C:\Reports\Sales Report.