On Nov 20, 2009, at 12:09 PM, Michael de Haan wrote:

> Did not see that it was deprecated, but will take your lead and convert them 
> to that. Does the, in your opinion, "optional" addition pretty much replace 
> categories as a whole, or is there still a role for them?


The addition of @optional and @required to Protocols is meant to replace the 
need for Informal Protocols. Categories are still very useful for adding 
functionality to a class, as Protocols only allow you to create an interface, 
not an implementation.
--
David Duncan
Apple DTS Animation and Printing

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