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=== Generic data model rules ===
A generic data model obeys the following rules<ref name="MW99">Matthew West and Julian Fowler (1999). [https://sites.google.com/site/drmatthewwest/publications/princ03.pdf Developing High Quality Data Models]. The European Process Industries STEP Technical Liaison Executive (EPISTLE).</ref>]:
# Candidate attributes are treated as representing relationships to other entity types.
# Entity types are represented, and are named after, the underlying nature of a thing, not the role it plays in a particular context. Entity types are chosen. Thus as a result of this principle, any occurrence of an entity type will belong to it from the time it is created to the time it is destroyed, not just whilst it is of interest. This is important when managing the underlying data, rather than the views on it used by applications. We call entity types that conform to this principle generic entity types.
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