Useful for separating classification dimensions. Do not infer that single means one cask or one cereal; bottling attributes are distinct from origin and blend composition. Current legal definitions need separate authoritative verification.
PDF 33 uses a playful biological taxonomy. It is a schematic classification, not a full statement of legal production requirements.
MacLean's taxonomy distinguishes Scotch's single malt, blended malt, single grain, blended grain and blended categories by malt/grain composition and number of originating distilleries. It separately lists geographic names and cask-strength/non-chill-filtered attributes.
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33
A Taxonomy of Scotch
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