如何在DocBook V5.0中使用RELAX NG模式创建新实体

Question

使用DocBook V4.x和DTD，我可以创建一个实体：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY mdash   "&#8212;">
]>
<article>
...
<title>Em dash</title>
<para>The em dash is perhaps the most versatile punctuation mark.
Depending on the context, the em dash can take the place of commas,
parentheses, or colons&mdash;in each case to slightly different effect.</para>
...
</article>

如何使用RELAX NG模式对DocBook V5.0执行同样的操作？：

<?xml version='1.0' encoding='utf-8'?>
<article xmlns='http://docbook.org/ns/docbook' version='5.0' xml:lang='en'>
...
<title>Em dash</title>
<para>The em dash is perhaps the most versatile punctuation mark.
Depending on the context, the em dash can take the place of commas,
parentheses, or colons&mdash;in each case to slightly different effect.</para>

Answer 1

不能使用RELAX NG定义一般实体。实体是DTD的东西。您要么需要使用内部DTD子集（如第一个代码示例），要么只使用硬编码的工具来识别实体（如Web浏览器）。