Hi, To clarify my question with an example :) The character 亀 (U+4E80) is listed in Unihan as a Z-variant of 龜 (U+9F9C). However, the opposite is not true. Similarly, 疍 (U+758D) is listed as a semantic variant of 蛋 (U+86CB), but not vice versa. From the definitions of these variant types in UAX#38, one would naturally expect them to be symmetrical, and both characters to show each other as variants. There are quite a few other such cases, although it does appear that in most cases the relation is symmetrical. My reason for asking, BTW, is that I'm thinking of grouping characters which are Z-variants of each other in some application, so I need to understand whether Z-variants are expected to have clear "cliques" in which each character is a Z-variant of all others. I realize that the semantic variant relation, at least, is based on external sources and not determined by Unicode; regarding Z-variants I'm not clear. I'd like to know though whether the relation is expected to be symmetrical, and the above cases are to be considered errors; or there is some meaning to a one-directional relation; or something else. On a side note, some Z-variants I've looked at seem to have very different abstract shapes, in some cases looking more like simplified/traditional pairs. As I said I don't know clearly how they are determined. Are they supposed to be exactly those pairs which would be unified if it were not for the Source Separation Rule?
TIA, Uriah
