XML 属性中哪些字符无效(除非已编码)?
问题描述：
我不敢相信我无法轻松访问此信息，因此:
I can't believe I can't find this information easily accessible, so:
1) 哪些字符不能在没有实体编码的情况下合并到 XML 属性中?
1) Which characters cannot be incorporated in an XML attribute without entity-encoding them?
显然，您需要对引号进行编码. 和 > 怎么样?还有什么?
Obviously, you need to encode quotes. What about < and >? What else?
2) 官方名单具体在哪里?
2) Where exactly is the official list?
答
这里是属性值中允许的内容.
'"' ([^<&"] | Reference)* '"' | "'" ([^<&'] | Reference)* "'"
所以，你不能:
- 打开/关闭属性值的相同字符(任一
'或") - 裸露的&符号(
&必须是&) - 一个左尖括号(
必须是<)
- the same character that opens/closes the attribute value (either
'or") - a naked ampersand (
&must be&) - a left angle bracket (
<must be<)
您也不应该使用任何完全不合法的字符XML 文档中的任何位置(例如表单提要等).
You should also not being using any characters that are outright not legal anywhere in an XML document (such as form feeds, etc).