I have accidentally noticed another problem in the revised Haskell report (actually the library report, this time). in module Char, toLower and toUpper appear to be under-specified (and indeed, the whole module looks a little suspect) Exactly what is wrong with them I find hard to say, and even harder to say what the cure should be, nevertheless: Firstly: "This module offers only a limited view of the full Unicode character set; the full set of Unicode character attributes is not accessible in this library." I take it this implies that operations in this module apply to the ENTIRE Unicode character set, so: "Function toUpper converts a letter to the corresponding upper-case letter, leaving any other character unchanged. Any Unicode letter which has an upper-case equivalent is transformed. Similarly, toLower converts a letter to the corresponding lower-case letter, leaving any other character unchanged." But this seems to assume there is a one-to-one mapping of upper-case to lower-case equivalent, and vice-versa. Apparently this is not so. (I'm only going on hearsay - something I saw on the xml-dev list yesterday - I haven't checked any of this). It seems that whilst the Unicode database's definitions of whether or not a character is upper/lower/title case are normative, the mappings from upper to lower case are only suggestive. This is because it depends upon language conventions as to how the mapping is done. In Turkish for instance, I is not the upper-case equivalent of i, and vice-versa (apparently there is a dotted i, and a non-dotted i, and likewise for I). So it would seem that the definitions: "-- Case-changing operations toUpper :: Char -> Char toUpper = primUnicodeToUpper toLower :: Char -> Char toLower = primUnicodeToLower" just beg the question - what should the primUnicodeToLower/ToUpper operations actually do? Should they be locale sensitive? -- Colin Paul Adams Preston Lancashire