2.1.3.3 LC_CTYPE, LC_COLLATE

LC_CTYPE and LC_COLLATE will be <locale>_iso8859-15 specific. Most of the delta characters in ISO 8859-15 (those different from ISO 8859-1) can be classified as uppercase or lowercase, thus requiring a locale-specific ISO 8859-15 classification. The delta characters will also be sorted differently than the characters that they replaced in ISO 8859-1 and must use a separate locale-specific ISO 8859-15 sort sequence.