如何使用 Java 和 Xerces 解析符合 1.1 规范的 XML?

问题描述

我正在尝试解析包含符合 XML 1.1 规范的 XML 内容的字符串.XML 包含在 XML 1.0 规范中不允许但在 XML 1.1 规范中允许的字符引用(字符引用转换为 U+0001–U+001F 范围内的 Unicode 字符).

I'm trying to parse a String which contains XML content which conforms to the XML 1.1 spec. The XML contains character references which are not allowed in the XML 1.0 spec but which are allowed in the XML 1.1 spec (character references which translate to Unicode characters in the range U+0001–U+001F).

根据 Xerces2 网站，Xerces2 解析器支持解析 XML 1.1 文档.但是，我不知道如何告诉它我们尝试解析的 XML 包含符合 1.1 的 XML.

According the Xerces2 website, the Xerces2 parser supports parsing XML 1.1 documents. However, I cannot figure out how to tell it the XML we are trying to parse contains 1.1-compliant XML.

我正在使用 DocumentBuilder 来解析 XML(类似这样):

I'm using a DocumentBuilder to parse the XML (something like this):

public Element parseString(String xmlString) {
    try {
          DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
          DocumentBuilder documentBuilder = dbf.newDocumentBuilder();

          InputSource source = new InputSource(new StringReader(xmlString));

      // Throws org.xml.sax.SAXParseException becuase of the invalid character refs
          Document doc = documentBuilder.parse(source);

          return doc.getDocumentElement();

    } catch (ParserConfigurationException pce) {
          // Handle the error
    } catch (SAXException se) {
          // Handle the error
    } catch (IOException ioe) {
          // Handle the error
    }
}

我已尝试设置 XML 标头以指示 XML 符合 1.1 规范...

I've tried setting the XML header to indicate the XML conforms to the 1.1 spec...

xmlString = "<?xml version="1.1" encoding="UTF-8" ?>" + xmlString;

...但仍被解析为 1.0 XML(仍会生成无效字符引用异常).

...but it is still parsed as 1.0 XML (still generates the invalid character reference exceptions).

如何配置 Xerces 解析器以将 XML 解析为 XML 1.1?是否有其他解析器可以为 XML 1.1 提供更好的支持?

How can I configure the Xerces parser to parse the XML as XML 1.1? Is there an alternative parser which provides better support for XML 1.1?

推荐答案

看这里 查看 xerces 支持的所有功能的列表.可能低于 2 个功能是您必须打开的.

See here for a list of all the features supported by xerces. May be below 2 features is what you have to turn on.

http://xml.org/sax/features/unicode-normalization-checking

True:执行 Unicode 规范化检查(如 XML 1.1 建议的第 2.13 节和附录 B 中所述)并报告规范化错误.

True: Perform Unicode normalization checking (as described in section 2.13 and Appendix B of the XML 1.1 Recommendation) and report normalization errors.

False:不报告 Unicode 规范化错误.

False: Do not report Unicode normalization errors.

http://xml.org/sax/features/xml-1.1

正确:解析器同时支持 XML 1.0 和 XML 1.1.
False:解析器仅支持 XML 1.0.
访问:只读自:Xerces-J 2.7.0注意:此功能的价值取决于 SAX 解析器拥有的解析器配置是否已知支持 XML 1.1.

True: The parser supports both XML 1.0 and XML 1.1.
False: The parser supports only XML 1.0.
Access: read-only Since: Xerces-J 2.7.0 Note: The value of this feature will depend on whether the parser configuration owned by the SAX parser is known to support XML 1.1.

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