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What are double asterisks for?

Subject: What are double asterisks for?
From: Ian Gillespie <email@hidden>
Date: Sun, 29 Dec 2002 12:57:54 -0800

For example:

- (id)initWithRTFDFileWrapper:(NSFileWrapper *)wrapper
documentAttributes:(NSDictionary **)docAttributes

Notice ** after the NSDictionary. I tried using this method and
passing a dictionary as an argument and I got a compile error:
Invoice.m:140: warning: passing arg 2 of
`initWithRTF:documentAttributes:' from incompatible pointer type

Can someone help please? Thanks.
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