XML 中的引号。单人还是双人？
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Quotes in XML. Single or double?
提问by Sergey Metlov
I've heard that using single quotes to surround XML attribute values is a "bad style". Is this correct?
我听说使用单引号将 XML 属性值括起来是一种“糟糕的风格”。这样对吗？
Should I always write:
我应该总是写：
<element attr="value">
Or is it acceptable to write:
或者是可以接受的写法：
<element attr='value'>
Or does it not matter which style I use?
或者我使用哪种风格无关紧要？
回答by Oded
Both are legal. Choose one and stick with it. It doesn't matter.
两者都是合法的。选择一个并坚持下去。没关系。
From the spec:
从规范：
AttValue ::= '"' ([^<&"] | Reference)* '"'
| "'" ([^<&'] | Reference)* "'"
Showing that both are valid, as is mixing the two styles within an element, per attribute (though I suggest being consistent within any single document/set of documents).
显示两者都是有效的，就像在元素中混合两种样式一样，每个属性（尽管我建议在任何单个文档/文档集内保持一致）。
回答by Michael Kay
Double quotes are more usual, and it's quite acceptable for any particular community to adopt a house style for the sake of consistency, but a blanket statement that one way of doing it is better has no justification.
双引号更常见，对于任何特定社区来说，为了一致性而采用一种房屋风格是完全可以接受的，但笼统地声明一种方法更好是没有道理的。
It's also dangerous to make such recommendations, since it encourages the "desperate perl hackers" who try to parse XML using regular expressions instead of using a real XML parser, and invariably only succeed in handling a subset of what XML legally allows.
提出这样的建议也是危险的，因为它鼓励“绝望的 perl 黑客”，他们试图使用正则表达式而不是使用真正的 XML 解析器来解析 XML，并且总是只能成功处理 XML 合法允许的子集。
I tend to use single quotes for convenience if I'm hand-generating XML from Java applications - though I'm increasingly inclining to the view that hand-generating XML is almost as dangerous as hand-parsing it.
如果我从 Java 应用程序手动生成 XML，我倾向于使用单引号来方便起见——尽管我越来越倾向于认为手动生成 XML 几乎与手动解析它一样危险。
