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You see that the relations in object form do not have a left hand term such as in Area = L*B. If an object such as Ship or Deck is created in this manner, they are automatically provided with the @LOCAL attribute. Non-object parameters that are used as goal or input arguments in the function do not necessarily need the @LOCAL attribute, as in the case of ID$ and Area, because they are automatically instantiated in the object. L and B, however, are not given as function arguments but introduced into the object by the relation Area = L*B. If L and B are not @LOCAL, the input is saved in the solution's top level. The result will be that all decks and bulkheads will have the same L and B since these can be found higher up in the model.

If Ship is selected as top goal (by double clicking on the Ship parameter) and the dialogue is started, you are requested to provide the number of decks, their respective L and B and the same for the bulkheads.

The result you get after finishing the dialogue is an object model of Ship containing all decks and bulkheadsall decks and bulkheads.

4 Object Initiation and Access

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