A bunch of questions that come after "Hello world"

[wojtek@power.com.pl (Wojtek Narczynski)]

Hello,

I am trying to write some Ada code after three years of Java work. I
have some questions, likely stupid.

1. Collections. I understand that Ada doesn't define collection
packages as a part of the standard. Pity, but maybe there is some
"rationale for that. Okay, what is the most commonly used library?
Booch components?

2. Could somebody confirm that I cannot define a procedure / function
as a member of a "record", but I sure can as a member of "protected"?
Hmm.

3. Can I define new 'Attributes or only redefine (some) existing ones?

Thanks for your time!