#VRML V2.0 utf8
Group {
 children [
    Shape {
     appearance Appearance {
       material Material { }
     }
     geometry Cone { }
    }
  DEF TOUCH TouchSensor { }    # define the sensor 
  DEF LIGHT DirectionalLight { # define the light 
    color 0 1 0                
    on FALSE
  }
 ]
ROUTE TOUCH.isOver TO LIGHT.set_on
}

Example 1: Defining nodes in VRML (DEFed nodes).