About arrays in plpgsql.

Hi,
	On reading a few tutorials on PL/SQL I came to know of something called 
"PL/SQL Tables"....these PL/SQL tables act much like arrays. (they are 
probably linked lists). I need to know if plpgsql also supports this 
feature?
	Otherwise can somebody let me know how to declare arrays in plpgsql..(is it 
necc. to create an array type and then use it in plpgsql functions?)

Thanks in advance,
Arun.
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