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imited but still large. ? XML includes facilities for identifying the encoding of the Unicode characters that make up the document, and for expressing characters that, for one reason or another, cannot be used directly. 樣例文本 C ? 最常見(jiàn)的 PI是用來(lái)指定 XML文件的樣式表: ? 這個(gè) PI一般會(huì)直接放在 XML序言之后,通常由