I really only have one comment, and that is around the need (and algorithm) for itemID generation.
* I think it would help greatly to add a statement or paragraph explaining why it's necessary. I personally don't really see the need, given a pubsub service MUST generate unique item IDs. * I think the algorithm is susceptible to collisions. If item ID generation is really necessary, I would suggest coming up with a stronger algorithm. - m&m Matthew A. Miller < http://goo.gl/LK55L >
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