需要了解 - 为什么 CDATA 部分被视为 <![CDATA[ 和 ]]>? [英] Need to understand - why CDATA section is treated as if the <![CDATA[ and ]]>?
问题描述
我正在阅读一本教科书来学习XPath.我从那本书中找到的下面一行:
I was reading a text book to learn XPath. And the below line I found from that book:
XPath 如何处理 XML CDATA 部分中的文本?CDATA 部分中的每个字符都被视为字符数据.换句话说，CDATA 部分被视为 和 ]]> 被删除，并且每次出现像 <; 和 & 被替换为相应的字符实体，如 < 和 &.
How does XPath handle text in XML CDATA sections? Each character within a CDATA section is treated as character data. In other words, a CDATA section is treated as if the
<![CDATA[and]]>were removed and every occurrence of markup like<and&was replaced by the corresponding character entities like<and&.
但是书中并没有给出任何例子来解释上面的句子.任何人都可以帮助我理解作者在下面要说的内容:
But the book didn't give any examples to explain the above sentences. Can any one help me to understand what the Author tried to say in the below:
CDATA 部分被视为 <![CDATA[ 和 ]]> 被删除，并且每次出现类似 的标记< 和 & 被替换为相应的字符实体，如 < 和 &.强>
a CDATA section is treated as if the
<![CDATA[and]]>were removed and every occurrence of markup like<and&was replaced by the corresponding character entities like<and&.
推荐答案
我反过来想 - <![CDATA[ 和下一个 ]] 之间的一切> 被视为文本，不受实体引用的通常解码的约束，并且 < 符号不引入元素名称.所以
I think of it the other way round - everything between a <![CDATA[ and the next ]]> is treated as text, and not subject to the usual decoding of entity references, and < signs don't introduce element names. So
<something><![CDATA[<foo>text&more</foo>]]></something>
与
<something><foo>text&more</foo></something>
而
<something><foo>text&more</foo></something>
不是格式良好的 XML(因为 & 被视为实体引用的开始，但没有相应的 ; 结束它).
is not well-formed XML (because the & is treated as the start of an entity reference but there's no corresponding ; to end it).
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