9. General Principles for Entity Types
Chapter Outline
9.1 An Example—Combined Entity Types 95
9.2 An Example—Stock 97
9.3 Getting Subtypes Wrong 98
9.4 An Example of Fixed Hierarchies—Stock Classification 100
9.5 Getting the Right Level of Abstraction 103
9.6 Impact of Using the Principles 104
In this chapter I present some examples of problems you can encounter with entity types and how to apply the principles for entity types from Chapter 6 to resolve them.
One of the biggest problems in managing data is identifying what is being talked about. That is, what is a sound basis for identifying and naming entity types? In order to be able to hold data about something, we need to identify what sort of thing
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