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PositionableStream
Last updated at 9:57 pm UTC on 18 September 2016
 PositionableStream subclasses 
 {ReadStream . WriteStream}

I represent an accessor for a sequence of objects (a collection) that are externally named by indices so that the point of access can be repositioned. I am abstract in that I do not implement the messages next and nextPut: which are inherited from my superclass Stream.