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This essay was originally published (and is freely available) in the Journal of Digital Information, Volume 1, Issue 7, (December 2000), and is reproduced here with permission.
Sieves sort readers through one or more layers of choice in order to direct them to sections or episodes. Sieves are often trees, but may be multitrees, DAB=Gs, or nearly-hierarchical graphs; different typologies may all serve the same rhetorical function. (Bernstein, p.24.)
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