code: def resolve(self):
          
  
          model = self.copy()
          
          for ct in model.component_types:
              model.resolve_component_type(ct)
  
          for c in model.components:
              if c.id not in model.fat_components:
                  model.add(model.fatten_component(c))
  
          for c in ct.constants:
              c2 = c.copy()
              c2.numeric_value = model.get_numeric_value(c2.value, c2.dimension)
              model.add(c2)
              
          return model
docs: Resolves references in this model.