9. General Principles for Entity Types
9.1 An Example—Combined Entity Types
9.3 Getting Subtypes Wrong
9.4 An Example of Fixed Hierarchies—Stock Classification
9.5 Getting the Right Level of Abstraction
9.6 Impact of Using the Principles
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
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
is. In order to be able to share ...