It expands entities and ignores processing instructions and comments.
可以扩充实体并忽略处理指示和注解。
Processing instructions and comments are also reduced to special tag names that are not available in XML: PI for the former, comment for the latter.
处理指令和注释也简化了标签名，这在XML中是无法实现的：前者用PI，后者用COMMENT。
The RFC moves on to coverage of content constructs with sections 4.5 and 4.6, which offer very sensible advice on when to use processing instructions and comments.
RFC在4.5和4.6节讨论内容结构，就何时使用处理指令和注释提供了非常合理的建议。
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