This workflow is a GWorkflowDL representation of a structured loop that updates the variable "x" in each iteration. This workflow is equivalent to the following pseudo code: x:=0; for ( i:=0; i<=99; i++) { x:=x+i; } x_result:=x; Please remark that this demonstration workflow does not invoke any external services at all. The calculation is done only by using the GWorkflowDL's syntax and semantics.