When you create links between scalar and array variables, you can specify which element of the array variable you want to link to or from. Scalar variables are those that hold a single value, such as String, Document, and Object. Array variables are those that hold multiple values, such as String List, String Table, Document List, and Object List. For example, you can link a String to the second element of a String List.

If you do not specify which element in the array variable that you want to link to or from, Designer uses the default rules in the Pipeline view to determine the value of the target variable. The following table identifies the default pipeline rules for linking to and from array variables.

A source variable that is the child of a Document List is treated like an array because there is one value of the source variable for each Document in the Document List. For example: