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Z-variant
In Unicode, two glyphs are said to be Z-variants (often spelled zVariants) if they share the same etymology but have slightly different appearances and different Unicode codepoints. For example, the Unicode characters U+8AAA 說 and U+8AAC 説 are Z-variants. The notion of Z-variance is only applicable to the “CJKV scripts” — Chinese, Japanese, Korean and Vietnamese — and is a subtopic of Han unification. ==Differences on the Z-axis== The Unicode philosophy of codepoint allocation for CJK languages is organized along three “axes.” The X-axis represents differences in semantics; for example, the Latin capital A (U+0041 A) and the Greek capital alpha (U+0391 Α) are represented by two distinct codepoints in Unicode, and might be termed “X-variants” (though this term is not common). The Y-axis represents significant differences in appearance though not in semantics; for example, the traditional Chinese character ''māo'' “cat” (U+8C93 貓) and the simplified Chinese character (U+732B 猫) are Y-variants.() The Z-axis represents minor typographical differences. For example, the Chinese characters (U+838A 莊) and (U+8358 荘) are Z-variants, as are (U+8AAA 說) and (U+8AAC 説). The glossary at ''Unicode.org''() defines “Z-variant” as “Two CJK unified ideographs with identical semantics and unifiable shapes,” where “unifiable” is taken in the sense of Han unification. Thus, were Han unification perfectly successful, Z-variants would not exist. They exist in Unicode because it was deemed useful to be able to “round-trip” documents between Unicode and other CJK encodings such as Big5 and CCCII. For example, the character 莊 has CCCII encoding 21552D, while its Z-variant 荘 has CCCII encoding 2D552D. Therefore, these two variants were given distinct Unicode codepoints, so that converting a CCCII document to Unicode and back would be a lossless operation.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Z-variant」の詳細全文を読む
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