正确使用XML的外部DTD [英] Proper use of External DTD for XML
问题描述
我有以下article.dtd
I have the following article.dtd
<!ELEMENT ARTICLE (HEADLINE,BYLINE,LEAD,BODY,NOTES)>
<!ELEMENT HEADLINE (#PCDATA)>
<!ELEMENT BODY (#PCDATA)>
<!ATTLIST ARTICLE AUTHOR CDATA #REQUIRED>
和article.xml
and article.xml
<?xml version="1.0" standalone="no"?>
<!DOCTYPE ARTICLE SYSTEM "article.dtd">
<ARTICLE AUTHOR="T. Daniel">
<HEADLINE>Title</HEADLINE>
<BODY>Details</BODY>
</ARTICLE>
我使用Google Chrome浏览器打开xml文件，当我访问页面源代码时，我只会获取article.xml的内容.
I open the xml file using Google Chrome browser, and when I'm accessing the page source I'm only getting the contents of the article.xml.
不是页面源应该合并两个文件(同时显示文档类型定义和xml文档)吗?如果是这样，为什么在我的示例中没有发生这种情况?如果不是，我应该如何检查我的xml是否根据我想要的dtd文件编写?
Isn't the page source supposed to combine the two files (show both document type definition and the xml document) ? And if so, why isn't that happening in my example? If not, how should I check if my xml is written according to the dtd file I want?
提及:article.dtd和article.xml位于同一文件夹中.
Mention: article.dtd and article.xml are in the same folder.
推荐答案
不是页面源应该合并两个文件(同时显示文档类型定义和xml文档)吗?
不，它不应该合并两个文件.
No, it is not supposed to combine the two files.
大多数浏览器不加载外部DTD.我找不到Chrome的明确参考，但我认为它类似于Mozilla/Firefox的工作方式( https://developer.mozilla.org/zh-CN/docs/XML_in_Mozilla#DTDs_and_Other_External_Entities ).
Most browsers do not load external DTDs. I could not find a definite reference for Chrome, but I think it's similar to how it works for Mozilla/Firefox (https://developer.mozilla.org/en-US/docs/XML_in_Mozilla#DTDs_and_Other_External_Entities).
如何检查我的xml是否根据我想要的dtd文件编写?
通过适当的验证程序运行它，例如 xmllint (
Run it through a proper validator, for example xmllint (a command line tool that comes with libxml2):
$ xmllint --valid article.xml
此命令的输出:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE ARTICLE SYSTEM "article.dtd">
<ARTICLE AUTHOR="T. Daniel">
<HEADLINE>Title</HEADLINE>
<BODY>Details</BODY>
</ARTICLE>
article.xml:6: element ARTICLE: validity error : Element ARTICLE content does not follow the DTD, expecting (HEADLINE , BYLINE , LEAD , BODY , NOTES), got (HEADLINE BODY )
</ARTICLE>
^
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