理解 XML CharData EBNF [英] Understanding XML CharData EBNF

问题描述

以下EBNF规则表示为

The following EBNF rule expressed as

CharData ::= [^<&]* - ([^<&]* ']]>' [^<&]*) 

我真的很难理解.有人可以举几个有效和无效字符串的例子.对规则中所表达的内容进行简要说明也会非常有帮助.虽然也许要求有点多.如果您有一段有趣的 C++ 代码片段可以帮助发现这种情况，那也将是非常好的.

is really hard for me to understand. Can someone give a few examples of valid and invalid strings. A brief explanation of the what is being expressed in the rule would also be very helpful. Although perhaps asking a little much. It would also be ultra nice if you have an interesting snippet of c++ code lying around that'll help catch this occurrence.

推荐答案

CharData,

[14] CharData ::= [^<&]* - ([^<&]* ']]>' [^<&]*)

表示XML字符数据可以由除

means that XML character data can consist of any characters except

• <，开始标记(标签、注释、XML 声明、CDATA 部分和 PI)
• &，开始实体引用，
• 字符串，]]>，结束 CDATA 部分.

• <, which begins markup (tags, comments, XML declarations, CDATA sections, and PIs)
• &, which begins entity references,
• the string of characters, ]]>, which ends a CDATA section.

转义:

• 在字符数据中将 < 转义为 <.
• 在字符数据中将 & 转义为 &.
• ]]> 不能出现在字符数据中；没有转义形式.

• Escape < as < in character data.
• Escape & as & in character data.
• ]]> cannot appear in character data; there is no escaped form.

另见:

• w3c 规范语法中的减法

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