check_foreign_key

Hi all,

The help document for CREATE TRIGGER shows an example of "simulating" a
foreign key by creating a trigger with a call to check_foreign_key (I
guess it has exactly the same result as using FOREIGN KEY?).

But what does the first argument to check_foreign_key really mean? And
to take the question further: are the internal functions/procedurs
documented somewhere? I've not been able to find any documentation of
check_foreign_key (for example), and it doesn't even show up when
typing \df at the psql prompt.

Best regards
Erik Ronström

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