The field Object in the postcard has the type Specific object
Basic Documentation Information object: Specific object
A particular object is something more precise than a theme but less precise than a temporal detail.
The themes are generic and a temporal detail is a detail that changes over time (a hairstyle, a coat, a car, a signature etc ... Postcard themes are generic enough to cover everything but not precise enough if you want to specialize. For example a card can have flowers as a theme but we do not know what flower it is or a car whose model or manufacturer cannot be defined. If we can define a precise model or constructor, we will rather use the temporal detail which makes it possible to locate a map in time.
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