http://www.w3.org/ns/prov#value | - At the core, the library very much is a channel, a channel is basically a queue, and you can attach a reader or a writer to it, for one end of the queues or the channel, and those are one-shot, so taking an item from the channel you give it a callback to execute when the value arrives and then once that happens, the callback is removed from the channel and you get one item for each callback attach
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