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Shown below is the same piece of (simple) logic. The age (of an applicant) is determined using his or her date of birth.

One might argue in favor of reusable expressions or attributes. Arguments to use one or the other are enumerated below.

1. When the expression is clearly only applicable for one entity, an attribute is favored.
2. When the expression is used in more entity, a reusable expression is favored. However, attributes that use this expression can still be modeled.
3. ...