GraphEdge interface 
Defines an edge within the web service's graph.
Properties
| source | 
	The source graph node's identifier.  | 
| source | 
	The identifier of the source node's port that the edge connects from.  | 
| target | 
	The destination graph node's identifier.  | 
| target | 
	The identifier of the destination node's port that the edge connects into.  | 
Property Details
		sourceNodeId
	  
	The source graph node's identifier.
sourceNodeId?: string
				Property Value
string
		sourcePortId
	  
	The identifier of the source node's port that the edge connects from.
sourcePortId?: string
				Property Value
string
		targetNodeId
	  
	The destination graph node's identifier.
targetNodeId?: string
				Property Value
string
		targetPortId
	  
	The identifier of the destination node's port that the edge connects into.
targetPortId?: string
				Property Value
string