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This issue was originally reported by Ashok Malhotra. We need a canonical form for the language datatype. Both upper and lower case variants are permitted. See http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Mar/0036.html (http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Mar/0036.html) This item was discussed in the meeting of 2003-11-21 (http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Nov/0050.html) This requirement has been resolved by providing a health warning noting that 'EN' and 'en' (for example) do not map to the same value, and that application-level logic is required if they are to be treated as the same for application purposes.