public ConnectionPointSide Side {get; set;}
public: property ConnectionPointSide Side { ConnectionPointSide get(); void set ( ConnectionPointSide value); }
This is a special feature for terminals, because the terminals have only a terminal number and the connection point designations are often empty. In such case routing algorithms can't decide which connection point will be used for a connection. The routing algorithms use the external/internal flag of a connection point in 2D, to determine the right terminal position in 3D or topologies.
For non-terminals this property will not be stored after executing StoreToObject.