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Difference between
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| - The second specialization is shown in Figure 4 and defines essential parts, which are parts that are required by a composite. In general, composite objects can contain a variety of different part types. For example, a car contains various parts including wheels, a chassis, bumpers, and so on. For cars, wheels can be considered essential, whereas sunroofs are optional. Essential parts are represented using the ''hasEssentialPart'' relationship and the ''EssentialPart'' concept. |
| + The second specialization is shown in Figure 4 and defines essential parts, which are parts that are required by a composite. In general, composite objects can contain a variety of different part types. For example, a car contains various parts including wheels, a chassis, bumpers, and so on. For cars, wheels are essential, whereas sunroofs are optional. Essential parts are defined using the ''hasEssentialPart'' relationship and the ''EssentialPart'' concept. |
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| - The third specialization, shown in Figure 5, describes unique parts. A collection object will have at most one unique part object, if a unique part is defined for the collection. A chassis is a unqiue part for a car, that is, any one car can have at most one chassis. Note that a chassis is also an essential part for a car. We permit part-whole specializations to be freely mixed. |
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| + The third specialization is shown in Figure 5 and describes unique parts, which are one-of-a-kind parts of a composite. An example of a unique part is a chassis -- any one car can have at most one chassis. Unique parts are defined using the ''hasUniquePart'' relationship and the ''UniquePart'' concept. Note that a chassis is also an essential part for a car. In general, we permit part-whole specializations to be freely mixed. |
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| - The last specialization, shown in Figure 6, defines unshareable parts. An unshareable part object can be a part of at most one collection at a time. |
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| + The last specialization is shown in Figure 6 and defines unshareable parts, which are parts that can be within at most one composite. All car parts are unshareable. Unshareable parts are defined using the ''isUnshareablePartOf'' relationship and the 'UnshareablePart'' concept. |
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