Another way of specifying connections is with port connections. A process instance ‘p’, whose type contains N ports can be connected: ‘p(...)’ with N comma-separated optional references.
p(x, y, , z, );
is equivalent to writing:
p.port1 = x;
p.port2 = y;
p.port4 = z;
A port connection must be written with the exact number of slots as ports in the process definition, where references may be omitted.