By Rosemary Rock-Evans
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Additional info for Data Modelling and Process Modelling. Using the Most Popular Methods
The 'Involuted' Relationship What happens if an Entity is related to itself? The answer is that we draw the relationship line to loop back on itself creating a sort of 'pig's ear' effect. Entities related to themselves are called 'involuted' relationships. The ex ample on the right shows the classic bill of materials case, when products may be made of products which themsel ves may be used in other products. Duplication Big models can get very cluttered with crossed lines and great long lines between Entitles on one side of the model and the other.
It also helps u s to keep records which our general hands use on feeding instructions. Feeding instructions don't apply to every animal type we have, but it provides u s with useful data on the type and quantity of food the animals need. This gives u s a picture of the proper nutritional balance we must provide for each animal. We try to provide as varied a diet as possible by using details about each food type, such as calorific value, contents, vitamin content, carbohydrate content etc. Notice that we don't have individual diets for each animal.
You will need a key irrespective of whether or not you access the Entity directly. But you may have a choice. For example, the theatre has two possible identifiers - the Theatre Code and The Theatre Directory Code. In this case the key of the Performance may be based on one of these two identifiers or it may itself have more than one identifier, depending on the direct accesses required. This can be determined during design. At the business modelling stage, it is useful to leave your options open, but provide the deliverable on which a choice can be made.