为了加快字符串等同性测试的速度，可以打开该特性。
如上一小节所述，字符实体等同于在文档中直接输入的引用字符。
As you'll recall from the previous section, the character entities are the same as if you'd typed the referenced character directly into the document.
由于—的替代文本是一个字符引用，因此它等同于输入一个短横线字符。
Because the replacement text for - is a character reference, it's exactly the same as typing an en dash character.
当然，这是XML，像空白字符标准化这样的问题允许不等同的文件表示相同的Infoset，但这里指的不是这个。
Of course, this being XML, issues like whitespace normalization allow non-identical files to represent the same Infoset; but that is not what I mean.
当然，这是XML，像空白字符标准化这样的问题允许不等同的文件表示相同的Infoset，但这里指的不是这个。
Of course, this being XML, issues like whitespace normalization allow non-identical files to represent the same Infoset; but that is not what I mean.
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