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Specialisation |
Sunday, 12 May 2002 |
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Martin Fowler
martinfowler.com
describes dynamic classification in his book
![]() ![]() dynamic classification is useful for conceptual modelling
Fowler supplies an example:
Hm, I agree with the largest part of Fowlers' book, but dynamic classification is sheer nonsense to me. In addition I find the example of a person's job rather weak.
Yes, a person-manager
could be modelled as specialisation.
But
Association or Specialisation?Fine, no dynamic classification for me. But what to use, an association or specialisation? And what makes the difference?
In my
Nut's weekly of 15 October 2001 the answer as
Fowler mentions these confusing meanings of "is" in
chapter 6, section
As an alternative he offers a question such as
That questions remains vague too, does not clearly distinct association from specialisation. Distinction question: Is cardinality meaningful?Idea: Look whether cardinality could apply. For example:![]()
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