如何在XML中使用ESC（&＃27;）字符？ [英] How to use ESC () character in XML?

问题描述

我正在尝试：

<root>
  text: &#27;
</root>

但解析器说：

org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 12; 
Character reference "&#27" is an invalid XML character.
  at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
  at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
  at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121)

如何使用它？

推荐答案

你不能（在XML 1.0中）。在XML 1.1中，您可以使用稍微更大的字符范围，而字符以不同的方式表示，但即使如此，&＃27; 是限制（十六进制是&＃x1B ; ），据我所知，这意味着它不是有效的XML，即使XML解析器应该成功处理它。请注意，'null'字符（&＃x00; ）从不生效。以下是维基百科文章中关于这些字符的XML

You cannot ( in XML 1.0). In XML 1.1 there is a slightly larger range of characters you can use, and the characters are expressed differently, but even then,  is 'restricted' (hex it is ) which, as far as I can tell, means that it is not valid XML, even though XML parsers should process it successfully. Note that the 'null' character (�) is never valid. Here's a Wiki article on these characters in XML

您可以尝试将XML文档强制为XML 1.1，并查看您的解析器是否会成功处理....将XML的第一行设置为：

You can try forcing the XML document to XML 1.1 and see if your parser will process it successfully.... set the first line of the XML to:

<?xml version="1.1"?>

事实上，我做到了，它的作品：

In fact, I did that, and it works:

<?xml version="1.1"?>
<root>&#27;</root>

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