BlueDim in Dimension with 
   dimcolor
    col : "0,0,210"
end 

Element Equipment end 

Element HeavyEquipment isA Equipment end 

(HeavyEquipment=>Equipment) with 
   dimension
    dim : BlueDim
end 

Element Excavator in HeavyEquipment isA Equipment  end 

(Excavator=>Equipment) with 
   dimension
    dim : BlueDim
end  

(Excavator->HeavyEquipment) with 
   dimension
    dim : BlueDim
end