set_link("duration", ValueNode_Const::create(Time(1)));
set_link("start_time", ValueNode_Const::create(Time(0)));
set_link("intersection", ValueNode_Const::create(Real(0.5)));
set_link("duration", ValueNode_Const::create(Time(1)));
set_link("start_time", ValueNode_Const::create(Time(0)));
set_link("intersection", ValueNode_Const::create(Real(0.5)));