使用libxml2解析xml时处理代理对 [英] Handling Surrogate pairs while parsing xml using libxml2
问题描述
我正在尝试使用libxml2解析xml.但是，有时我得到的代理对的代码点超出了 http://www.w3.org/TR/REC-xml/#NT-Char
因此，我的libxml2解析器无法解析它，因此出现错误.有人可以告诉我在使用libxml2解析XML时如何处理代理对.
I am trying to parse xml using libxml2. However, sometimes I get code points of surrogate pairs in it which are outside the range specified in http://www.w3.org/TR/REC-xml/#NT-Char
Because of this, my libxml2 parser is not able to parse it and thus I get error. Can somebody tell me how to handle surrogate pairs while parsing XML using libxml2.
我要解析的示例xml是:
An example xml I want to parse is:
<?xml version="1.0" encoding="UTF-8"?>
<message><body> ��</body></message>
推荐答案
请注意，xD83D是一个很高的替代品.代理对由高代理和低代理组成.彼此相邻的两个高替代物不是替代物对"，这是胡说八道.
Note that xD83D is a high surrogate. A surrogate pair consists of a high surrogate and a low surrogate; having two high surrogates next to each other is not a "surrogate pair", it is nonsense.
还要注意，用XML表示非BMP字符的正确方法是作为组合字符的单个字符引用，例如𒂫.在某些字符编码中，需要将非BMP字符拆分为两个替代，但在XML字符引用中则不需要(或不允许). XML中的字符引用表示Unicode代码点，而不是特定字符编码专用的数字值.
Also note that the correct way to represent a non-BMP character in XML is as a single character reference for the combined character, for example 𒂫. Splitting a non-BMP character into two surrogates is needed in some character encodings, but it is not needed (or allowed) in XML character references. Character references in XML represent Unicode code-points, not the numeric values specific to a particular character encoding.
如果您无法修复创建此错误XML的程序，则最好的方法是使用脚本(例如在Perl中查找无效的字符引用对，并将其替换为正确的XML表示形式.
If you can't fix the program that created this bad XML, then the best approach would be to repair it using a script e.g. in Perl that looks for the invalid character references pairs and replaces them with the correct XML representation.
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