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Corticon Studio: Rule Modeling Guide : Building the Vocabulary : Designing the Vocabulary : Step 2: Separating the Generic Terms from the Specific
 

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Step 2: Separating the Generic Terms from the Specific
Why did we only circle the aircraft term above and not the names of the aircraft in the fleet?  It is because 747 and DC-10 are specific types of the generic term aircraft. The type of aircraft can be said to be an attribute of the generic aircraft entity. Along these same lines, we also know from the example that several cargo shipments and flight plans can exist. Like the specific aircraft, these are instances of their respective generic terms. For the Vocabulary, we are only interested in identifying the generic (and therefore reusable) terms.  But ultimately, we also will need a way to identify specific cargo shipments and flight plans from within the set of all cargo shipments and flight plans – assigning values to attributes of a generic entity will accomplish this goal, as we will see later.