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Hello! > a replacement for unknown. In a former e-mail, I suggested something like: 2008-08-08/yueu which explains itself, if we consider an acceptable similarity between "unknown" and "unspecified" in such a case. But, according to the latest three-level suggestion, > intervals, [...] including open and unknown. are in level one, whereas longYear is in level two, which may cause problems. If we consider that "unknown" and "unspecified" are too dissimilar, we may keep the whole word "unknown". If we agree on the similarity considered above, I would suggest to move longYear to level one and use "yueu" instead of "unknown" when on one side of an interval. In this case, a question remains: Should we write yueu/0010 or y-ueu/0010 or y(-)?ueu/0010 or should we leave it as "yueu/0010" and consider that a potential minus sign may be "included" within the first "u"? Regards! SaaĊĦha,