| http://www.w3.org/ns/prov#value | - A specific example of an optical code comprises linear or two-dimensional codes, wherein data is coded by appropriate combinations of elements with a predetermined shape, i.e. square, rectangles or hexagons, of dark colors (normally black), separated by light elements (spaces, normally white), such as bar codes, stacked codes (including PDF417), Max codes, Datamatrix, QR codes, or colour codes etc
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