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Difference between
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| - There are four distinct ways that part-whole relationships can be specialized within the core, shown in Figures 3 - 6. The first specialization, defined in Figure 3, allows parts to be inseparable. That is, all __InseparablePart__ objects are contained within at least one composite object -- the object will not exist separately from a collection. |
| + There are four ways that part-whole relationships are specialized in the core, shown in Figures 3 - 6. The first specialization is shown in Figure 3 and defines inseparable parts, which are parts that are always contained within at least one composite -- the part object does not exist separately from a colleciton. The notion of an inseparable part is defined using a new relationship, ''inseparablePartOf'', and a new concept ''InseparablePart''. |
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| - The second specialization, shown in Figure 4, describes the notion of an essential part. A composite object in general can contain heterogeneous parts, for example, a car is made up of wheels, a chassis, bumpers, and so on. An essential part denotes a specific type of part that all objects of a particular type of collection must posses. Wheels are generally considered an essential part of a car, whereas a sunroof is not an essential part. |
| + The second specialization is shown in Figure 4 and defines essential parts, which are parts that a composited requires. In general, composite objects can contain a variety part types, for example, a car is made up of wheels, a chassis, bumpers, and so on. For a car, wheels are generally considered essential parts, however, sunroofs are not. The notion of an essential part is defined using a new relationship, ''hasEssentialPart'', and a new concept ''EssentialPart''. |
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