SDD data challenge: Negative descriptive statements

TDWG working group: Structure of Descriptive Data (SDD)

flowers red or yellow, but never orange
flowers orange, but usually not red or yellow
flowers dark orange, but never red, brown, or yellow

See the related discussion and proposal: "Negative descriptive statements".

Gregor Hagedorn, Vers. 1, 17. October 2002

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First published 2002-10-17, last update: 2002-10-17.