esented in FIGS. 2A and 2B. [0024]FIG. 3A is a flow chart of a workflow process having two consecutive parallel blocks. [0025]FIG. 3B is a table showing the formal definition of the workflow shown in FIG. 3A. [0026]FIG. 3C is a graphical tree representation of the workflow represented in FIGS. 3A and 3B. [0027]FIG. 4A is a flow chart of a workflow process having a parallel block within a parallel