Error & Missing explanation in docs regarding Auto Increment / Identity

Hi Data Modeler-Team, Hi fellow readers,
could you please explain the meaning of option
"Column Properties" - "General" - "Identity" (next to "Auto Increment"), as I don't see a logical difference between those two.
Also, the meaning of these fields is left out in the docs under
http://docs.oracle.com/cd/E18464_01/doc.30/e15802.pdf "3.8 Column Properties" - "General" (page 75)
Thanks,
Blama
(WinXP, Version 3.0.0.665)
Edited by: bl**** on 30.12.2011 15:40

Hi Philip, Hi David,
thank you for your answers.
I saw now that "identity" is removed for one column if I assign "identity" to another column and that I can have many auto-increments within one table.
But what does "identity" mean exactly? I don't see a difference in the displayed relational model and also don't see a difference in the created DDL.
Isn't "identity" from the meaning the same as a Primary Key?
Thanks,
Blama

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