Defines the content and structure of the input. The argument should be
either a module, or a (nested) table of module. The input to the DAG
should be a (nested) table of inputs with the corresponding structure.
Defines the content and structure of the input. The argument should be
either a module, or a (nested) table of module. The input to the DAG
should be a (nested) table of inputs with the corresponding structure.