Dear All, How would I derive a case mapping from LDML. For example, how would I use tr.xml to derive that lc(I)<>dotless i and uc(i)<>dotted cap I? I realise there is something deep a mysterious going on in 2.5 level collation that is described rather opaquely. Is this where the information is? Or do I need to look somewhere else? TIA, Yours, Martin