Developer Workflow Guide

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Parameter Names in Expressions and Strings

When you use a workflow parameter name in an expression or a string field, you can select the name from the

Inputs

tab or you can type the name using the required syntax.

The following table shows the required syntax for workflow parameter names in expression and string fields:

Field	Syntax	Example
Expression in a conditional sequence flow or in an Assignment task	$par:<parameter_name>	For example, you create the following expression in a conditional sequence flow: $par:Connection=SourceConnection The Data Integration Service evaluates the condition and runs the connected task if the parameter value is SourceConnection.
String field for a Command or Notification task	${par:<parameter_name>}	When you enter a parameter name in a string field for a Command or Notification task, you must include brackets around the parameter name. For example, the following command in a Command task uses a workflow parameter named SourceDirectory to define the source directory from which the command copies a file: copy ${par:SourceDirectory} H:\marketing\