The first 256 code points were made identical to the content of ISO 8859-1 so as to make it trivial to convert existing western text. This simple aim becomes complicated, however, by concessions made by Unicode's designers in the hope of encouraging a more rapid adoption of Unicode. In other words, Unicode represents a character in an abstract way and leaves the visual rendering (size, shape, font or style) to other software, such as a web browser or word processor. In text processing, Unicode takes the role of providing a unique code point - a number, not a glyph - for each character. In the case of Chinese characters, this sometimes leads to controversies over distinguishing the underlying character from its variant glyphs (see Han unification). Unicode, in intent, encodes the underlying characters - graphemes and grapheme-like units - rather than the variant glyphs (renderings) for such characters. Many traditional character encodings share a common problem in that they allow bilingual computer processing (usually using Roman characters and the local script) but not multilingual computer processing (computer processing of arbitrary scripts mixed with each other). Unicode has the explicit aim of transcending the limitations of traditional character encodings, such as those defined by the ISO 8859 standard, which find wide usage in various countries of the world but remain largely incompatible with each other. 4.1 Philosophical and completeness criticisms.2.2 Ready-made versus composite characters. 2.1 Unicode Transformation Format and Universal Character Set.The most commonly used encodings are UTF-8 (which uses 1 byte for all ASCII characters, which have the same code values as in the standard ASCII encoding, and up to 4 bytes for other characters), the now-obsolete UCS-2 (which uses 2 bytes for all characters, but does not include every character in the Unicode standard), and UTF-16 (which extends UCS-2, using 4 bytes to encode characters missing from UCS-2). Unicode can be implemented by different character encodings. The standard has been implemented in many Success at unifying character sets has led to its widespreadĪnd predominant use in the internationalization Scope and are incompatible with multilingual Replacing existing character encoding schemes with UnicodeĪnd its standard Unicode Transformation Format (UTF) schemes,Īs many of the existing schemes are limited in size and Unicode's development, has the ambitious goal of eventually The Unicode Standard, Unicode consists of a repertoireĪ set of code charts for visual reference, an encoding methodologyĮncodings, an enumeration of character properties suchįiles, and a number of related items, such as characterĭisplay order (for the correct display of text containingīoth right-to-left scripts, such as ArabicĬonsortium, the non-profit organization that coordinates Developed in tandem with the UniversalĬharacter Set standard and published in book form as To consistently represent and manipulate text
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |