在Docbook 5中使用正确的xlink名称空间是什么?

问题描述

如果我具有以下Docbook 5 XML:

If I have the following Docbook 5 XML:

<article xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0">
    <title>Test</title>
    <section>
        <title>LS command</title>
        <para xml:id="ls">
            This command is a synonym for <command linkend="dir">DIR</command> command.
        </para>
        <para xml:id="dir">
            This command is a synonym for <command linkend="ls">LS</command> command.
        </para>
        <para>
            <application xl:href="http://www.gnu.org/software/emacs/">Emacs</application>
        </para>
    </section>
</article>

，我尝试根据从此处下载的Docbook 5 DTD进行验证. a>与:

and I attempt to validate it against the Docbook 5 DTD downloaded from here with:

xmllint --noout --dtdvalid docbook.dtd test.xml

我收到以下错误:

test.xml:1: element article: validity error : No declaration for attribute xmlns:xl of element article
test.xml:11: element application: validity error : No declaration for attribute href of element application

但是，如果我将xl命名空间更改为xlink，就像这样:

However, if I change the xl namespace to xlink, like so:

<article xmlns="http://docbook.org/ns/docbook" 
                 xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
    <title>Test</title>
    <section>
        <title>LS command</title>
        <para xml:id="ls">
            This command is a synonym for <command linkend="dir">DIR</command> command.
        </para>
        <para xml:id="dir">
            This command is a synonym for <command linkend="ls">LS</command> command.
        </para>
        <para>
            <application xlink:href="http://www.gnu.org/software/emacs/">Emacs</application>
        </para>
    </section>
</article>

一切都很好.我从Docbook文档此处中获得了xl命名空间(以及使用示例带有外部参照的应用程序的文章直接来自该文档.

Everything validates just fine. I got the xl namespace from the Docbook documentation here (and the example of using an article with an application that had a xref is straight from that documentation).

那么为什么xl成功后xl会失败?

So why does xl fail when xlink succeeds?

推荐答案

问题实际上是DocBook 5.0 DTD专门列出了xlink:href属性，而其他属性均无效.

The issue was actually that the DocBook 5.0 DTD specifically listed the xlink:href attribute, and any others were not valid.

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