我正在使用 Fop 生成 PDF 文件，并且我有 xml 和 xsl 源来转换 xsl-fo 对象，但 PDF 文件显示为空白，请帮助我...
这是我作为字符串的 XML 响应：
<enqResponse>…<cols><c>ID</c><c>DESCRIPTION</c></cols>….<r><c><cap>1111</cap><i>4</i></c><c><cap>Banks</cap></c></r>… </enqResponse>
这是我的 Xslt 文件：
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.1" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:java="http://xml.apache.org/xslt/java" exclude-result-prefixes="java">
<xsl:output method="xml" version="1.0" omit-xml-declaration="no" indent="yes"/>
<xsl:template match="enqResponse">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:fox="http://xml.apache.org/fop/extensions">
<fo:layout-master-set>
<fo:simple-page-master master-name="my-page" page-width="50in" page-height="80in">
<fo:region-body margin-top="1in" margin-bottom="1in" />
<fo:region-before extent="2in"/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="my-page">
<fo:static-content flow-name="xsl-region-before">
<fo:block font-size="12pt" font-weight="bold" text-align="center"><xsl:value-of select="title"/></fo:block>
</fo:static-content>
<fo:flow flow-name="xsl-region-body">
<fo:block><xsl:apply-templates select="cols"/></fo:block>
<fo:block><xsl:apply-templates select="r"/></fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
<xsl:template match="cols">
<fo:table table-layout="fixed" width="100%">
<!--<fo:table-column column-width="2in"/>
<fo:table-column column-width="4in"/>
--><fo:table-body>
<fo:table-row>
<xsl:for-each select="c">
<fo:table-cell>
<fo:block><xsl:value-of select="."/></fo:block>
</fo:table-cell>
</xsl:for-each>
</fo:table-row>
</fo:table-body>
</fo:table>
</xsl:template>
<xsl:template match="r">
<fo:table table-layout="fixed" width="100%">
<!--<fo:table-column column-width="12in"/>
<fo:table-column column-width="12in"/>
--><fo:table-body>
<fo:table-row>
<xsl:for-each select="c">
<fo:table-cell>
<fo:block><xsl:value-of select="cap"/></fo:block>
</fo:table-cell>
</xsl:for-each>
</fo:table-row>
</fo:table-body>
</fo:table>
</xsl:template>
</xsl:stylesheet>
当我将 xml 下载为 PDF 时，它会生成空白的 pdf 文件，请就此提出您的建议，并让我知道 xslt 文件中的任何错误。
我有带有静态内容的 xslt 文件并且它正确显示为 PDF 带有静态内容的 Xslt 文件
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.1" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:java="http://xml.apache.org/xslt/java" exclude-result-prefixes="java">
<xsl:output method="xml" version="1.0" omit-xml-declaration="no" indent="yes"/>
<xsl:template match="enqResponse">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:fox="http://xml.apache.org/fop/extensions">
<fo:layout-master-set>
<fo:simple-page-master master-name="my-page">
<fo:region-body margin="2in"/>
<fo:region-before extent="1.0cm"/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="my-page">
<fo:static-content flow-name="xsl-region-before" >
<fo:block font-size="12pt" text-align="center">Page-1/1</fo:block>
</fo:static-content>
<fo:flow flow-name="xsl-region-body">
<fo:block space-after="1.0cm">Welcome</fo:block>
<fo:block>
<fo:table table-layout="fixed" width="100%">
<fo:table-body>
<fo:table-row>
<fo:table-cell>
<fo:block>No</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Name</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Phone Number</fo:block>
</fo:table-cell>
</fo:table-row>
<fo:table-row>
<fo:table-cell>
<fo:block>Test1</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Test2</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Test3</fo:block>
</fo:table-cell>
</fo:table-row>
</fo:table-body>
</fo:table>
</fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
</xsl:stylesheet>
请给出从给定的xml字符串中提取动态数据以生成PDF文件的解决方案............