| http://www.w3.org/ns/prov#value | - Books on an empty shelf.shelf noun pl. shelves a thin, flat length of wood or other material fixed horizontally at right angles to a wall and used for holding things a similar support, usually one of a set, built into a frame, as in a bookcase or cupboard the contents or capacity of a shelf something like a shelf; specif., a flat ledge jutting out from a cliff a sandbar or sandy reef a layer of be
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