Pattern - Structured Discriminator (1-out-of-M Join) true true http://www.gridworkflow.org/gworkflowdl/images/exec.png http://www.gridworkflow.org/gworkflowdl/images/exec.png 0 http://www.gridworkflow.org/gworkflowdl/images/exec.png 1 http://www.gridworkflow.org/gworkflowdl/images/i_plus_plus.png $i < 2 http://www.gridworkflow.org/gworkflowdl/images/i_end.png $i >= 2