public void addInterfaceLink(XClassType implementor, XClassType iface) throws UnknownTypeException {
public void addInterfaceLink(XObjectType implementor, XClassType iface) throws UnknownTypeException {
	public void addInterfaceLink(XClassType implementor, XClassType iface) throws UnknownTypeException {		inheritanceGraph.createEdge(implementor, iface, InheritanceGraphEdgeTypes.INTERFACE_EDGE);	}