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In computing, plain text is the contents of an ordinary sequential file readable as textual material without much processing. Plain text is different from formatted text, where style information is included, and "binary files" in which some portions must be interpreted as binary objects (encoded integers, real numbers, images, etc.). The encoding has traditionally been either ASCII, sometimes EBCDIC. Unicode-based encodings such as UTF-8 and UTF-16 are gradually replacing the older ASCII derivatives limited to 7 or 8 bit codes. ==Plain text and rich text== Files that contain markup or other meta-data are generally considered plain-text, as long as the entirety remains in directly human-readable form (as in HTML, XML, and so on (as Coombs, Renear, and DeRose argue, punctuation is itself markup)). The use of plain text rather than bit-streams to express markup, enables files to survive much better "in the wild", in part by making them largely immune to computer architecture incompatibilities. According to The Unicode Standard, * «''Plain text'' is a pure sequence of character codes; plain Ue-encoded text is therefore a sequence of Unicode character codes.» * ''styled text'', also known as ''rich text'', is any text representation containing plain text completed by information such as a language identifier, font size, color, hypertext links.〔 (The Unicode Standard, version 6.1, General Structure, page 14 )〕 For instance, Rich text such as SGML, RTF, HTML, XML, and TEX relies on plain text. Wiki technology is another such example. According to The Unicode Standard, plain text has two main properties in regard to rich text: * «plain text is the underlying content stream to which formatting can be applied.» * «Plain text is public, standardized, and universally readable.».〔 (The Unicode Standard, version 6.1, General Structure, page 14 )〕 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「Plain text」の詳細全文を読む スポンサード リンク
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