El 1/17/07 8:50 AM, "Todd Blanchard" <tblanchard at mac.com> escribió:

> Collection lacks ordering as concept.
> SequenceableCollections are immutable.
> OrderedCollection is first one that is mutable and allows adding/
> removing elements.
> 
> -Todd Blanchard

Ok. I get. 
My mistake was what in real life any objects what you collect always have a
"first" and "last".

If I describe what objects are now on top my desk, always see some first, my
glasses , pen , etc,  but of course is subjective and could't be translated
to a computer.

Very thanks.

Edgar



	

	
		
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