Docbook+Ant：找不到名称为 fop.extensions 的变量
在花费了大量时间尝试使用 Docbook 在 Ant 中编译我的文章后，我似乎无法使 FO 编译工作。我使用的是 Xalan 2.7.0，其他所有内容（单页和分块 HTML）都可以完美编译。只有当我尝试编译为 FO 时，我才会收到此错误：
Fatal Error! org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of fop.extensions Cause: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of fop.extensions
这很奇怪，我似乎无法解决它。我什至添加了一个 值来定义它“找不到”的变量：
<xslt style="docbook-xsl/fo/fo.xsl" in="documents/book.xml"
out="output.fo">
<classpath>
<fileset dir="lib" includes="**/*"/>
</classpath>
<param name="fop.extensions" expression="1"/>
</xslt>
我可以做些什么来解决这个问题吗？如果你问我的话，我真的很奇怪。 （再次，使用与上面相同的代码，我所有其他 Docbook 编译都工作得很好）
After a lot of spent time trying to get my article to compile in Ant with Docbook, I can't seem to make FO compilation work. I'm using Xalan 2.7.0, and everything else (both single-page and chunked HTML) compiles perfectly. It's only when I try to compile to FO that I get this error:
Fatal Error! org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of fop.extensions Cause: org.apache.xml.utils.WrappedRuntimeException: Could not find variable with the name of fop.extensions
This is pretty strange and I can't seem to resolve it. I even added a <param> value defining the variable it "can't find:"
<xslt style="docbook-xsl/fo/fo.xsl" in="documents/book.xml"
out="output.fo">
<classpath>
<fileset dir="lib" includes="**/*"/>
</classpath>
<param name="fop.extensions" expression="1"/>
</xslt>
Is there anything I can do to resolve this issue? It's really weird if you ask me. (Again, using the same code as above, all of my other Docbook compilation works just fine)
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不要使用
fo/fo.xsl，而是尝试fo/docbook.xsl。这是 XSL-FO 输出的主要样式表。Instead of using
fo/fo.xsl, tryfo/docbook.xsl. That is the main stylesheet for XSL-FO output.