The extended character set is a superset of the basic character set (2.2).

扩展字符集是基本字符集(2.2)的超集。

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Table 2: Basic encoding set character in rt.jar.

表2 . rt . jar中的基本编码集字符。

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In a Level 3 document, you can specify the document's character encoding or set some of its basic XML declarations like version and standalone.

在第3级文档中，可以指定文档的字符编码或者设置一些基本的XML声明，如version和standalone。

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