Airbus "family ratings" ?

From: (Wolfgang Diestelkamp)
Date:         16 Mar 93 21:57:45 PST
Organization: Technical University of Berlin, Germany
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Yesterday there was an article about Airbus 321's roll-out
in our local newspaper.
In the end, when listing the 321's advantages, there was a
quote that "the Airbus family is better, because the crew
doesn't need any additional training for another model" ?
Does this mean there is a "family rating", like there is one
for the ATR-42/ATR72, and if so, what exactly is the 
"Airbus family"; just the 32x, or all Airbus models ?
Or does all this only apply to the service crew ?
Wolfgang Diestelkamp