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Hello! The MODS guidelines at http://www.loc.gov/standards/mods/v3/mods-userguide-elements.html#coordinates state that: > No three points should be co-linear, I wonder whether this should be interpreted as an exclusion of polygon concavity or if this sentence should be reformulated in the guidelines. If concave polygons are allowed, then I consider that three (or more) co-linear points should be allowed when these points do not directly follow each other. Regards! SaaĊĦha,