Labeling flow objects

• Problem is to get content of make expression into right port
• A flow object in a sosofo can be labeled with a name
• An unlabelled flow object will be attached to the principal port of the constructed flow object
• The labels on flow objects in the content sosofos of a flow object constructor expression are matched against the names of the ports of the flow object being constructed
• If a label matches a port name, then the flow objects with that label will be attached to that port of the constructed flow object in the flow object tree