exploiting features of pg to obtain polymorphism maintaining ref. integrity

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Is there any good documentation, example, tutorial, pamphlet, discussion... to exploit pg features to obtain
"polymorphic"behavior without renouncing to referential integrity? 

Inheritance seems *just* promising.

Any methodical a approach to the problem in pg context?

--
Ivan Sergio Borgonovo
http://www.webthatworks.it


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