1492 Unicode (Web design templates) (on CD) Appendix K being upgraded
1492 Unicode (on CD) Appendix K being upgraded because it often simplifies changes to existing programs. For this reason, UTF-8 has become the encoding form of choice on the Internet. Likewise, UTF-16 is the encoding form of choice on Microsoft Windows applications. UTF-32 is likely to become more widely used in the future as more characters are encoded with values above FFFF hexadecimal. Also, UTF-32 requires less sophisticated handling than UTF-16 in the presence of surrogate pairs. Figure K.1 shows the different ways in which the three encoding forms handle character encoding. K.3 Characters and Glyphs The Unicode Standard consists of characters, written components (i.e., alphabets, numbers, punctuation marks, accent marks, etc.) that can be represented by numeric values. Examples of characters include: U+0041 LATIN CAPITAL LETTER A. In the first character representation, U+yyyy is a code value, in which U+ refers to Unicode code values, as opposed to other hexadecimal values. The yyyy represents a four-digit hexadecimal number of an encoded character. Code values are bit combinations that represent encoded characters. Characters are represented using glyphs, various shapes, fonts and sizes for displaying characters. There are no code values for glyphs in the Unicode Standard. Examples of glyphs are shown in Fig. K.2. The Unicode Standard encompasses the alphabets, ideographs, syllabaries, punctuation marks, diacritics, mathematical operators, etc. that comprise the written languages and scripts of the world. A diacritic is a special mark added to a character to distinguish it from another letter or to indicate an accent (e.g., in Spanish, the tilde ~ above the character n ). Currently, Unicode provides code values for 94,140 character representations, with more than 880,000 code values reserved for future expansion. Character UTF-8 UTF-16 UTF-32 LATIN CAPITAL LETTER A 0×41 0×0041 0×00000041 GREEK CAPITAL LETTER 0xCD 0×91 0×0391 0×00000391 ALPHA CJK UNIFIED IDEOGRAPH0xE4 0xBA 0×95 0×4E95 0×00004E95 4E95 OLD ITALIC LETTER A 0xF0 0×80 0×83 0×80 0xDC00 0xDF00 0×00010300 Fig. K.1Fi Correlation between the three encoding forms. Fig. K.2Various glyphs of the character A. Fig.
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