XSLT处理器可以保留空的CDATA节吗? [英] Can an XSLT processor preserve empty CDATA sections?
问题描述
我正在处理XML文档(InstallAnywhere .iap_xml安装程序),然后再将其交给另一个工具(InstallAnywhere本身)以更新某些值.但是,看来我正在使用的XSLT转换正在从文档中剥离CDATA节(对InstallAnywhere似乎很重要).
I'm processing an XML document (an InstallAnywhere .iap_xml installer) before handing it off to another tool (InstallAnywhere itself) to update some values. However, it appears that the XSLT transform I am using is stripping CDATA sections (which appear to be significant to InstallAnywhere) from the document.
我正在使用Ant 1.7.0,JDK 1.6.0_16和基于身份的样式表:
I'm using Ant 1.7.0, JDK 1.6.0_16, and a stylesheet based on the identity:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" encoding="UTF-8" cdata-section-elements="string" />
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
基本上,字符串"节点看起来像:
Basically, "string" nodes that look like:
<string><![CDATA[]]></string>
被处理为:
<string/>
通过阅读XSLT常见问题解答,我发现就XSLT规范而言,发生的事情是合法的.有什么办法可以防止这种情况发生,并说服XSLT处理器发出CDATA部分?
From reading XSLT FAQs, I can see that what is happening is legal as far as the XSLT spec is concerned. Is there any way I can prevent this from happening and convince the XSLT processor to emit the CDATA section?
推荐答案
为此,您需要为空的string
元素添加特殊情况并使用disable-output-escaping
.我没有要测试的Ant副本,但是以下模板与libxml
的xsltproc
一起为我工作,该模板表现出与您描述的相同的行为:
To do this, you'll need to add a special case for empty string
elements and use disable-output-escaping
. I don't have a copy of Ant to test with, but the following template worked for me with libxml
's xsltproc
, which exhibits the same behavior you describe:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" cdata-section-elements="string"/>
<xsl:template match="string">
<xsl:choose>
<xsl:when test=". = ''">
<string>
<xsl:text disable-output-escaping="yes"><![CDATA[]]></xsl:text>
</string>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="."/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
输入:
<input>
<string><![CDATA[foo]]></string>
<string><![CDATA[]]></string>
</input>
输出:
<input>
<string><![CDATA[foo]]></string>
<string><![CDATA[]]></string>
</input>
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