我想将XML文件转换为CSV文件。我要导出的字段是<issues>。每个问题都有一组标准字段和一些自定义字段。可能的自定义字段在<issue-custom-fields>中定义。并非每个<issue>都设置了所有自定义字段。对于CSV导出，我必须为每个缺失的条目添加一个空字段（",,"）。我该怎么做？
以下xslt文件遍历所有问题字段和所有自定义字段。而不是“田地价值？”我想在当前项目中查找相应的字段值（如果存在，如果不存在则为空白）。
XSLT版本应为1.0。
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="text" />
<xsl:template match="/">
<xsl:apply-templates select="xml_data/issues"/>
</xsl:template>
<xsl:template match="issue">
<xsl:for-each select="*">
<xsl:choose>
<xsl:when test="name(.) = 'custom-values'">
<xsl:for-each select="/xml_data/issue-custom-fields/issue-custom-field">
<xsl:variable name="f" select="id" />
<xsl:text>field value?</xsl:text>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="."/>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
</xsl:transform>
根据以下数据采取行动：
<?xml version="1.0" encoding="UTF-8"?>
<xml_data>
<projects type="array">
<project>
<id type="integer">10</id>
<name>Helpdesk</name>
<type>open</type>
</project>
<project>
<id type="integer">20</id>
<name>Development</name>
<type>closed</type>
</project>
</projects>
<issue-custom-fields>
<issue-custom-field>
<id>1000</id>
<name>Delay</name>
</issue-custom-field>
<issue-custom-field>
<id>1001</id>
<name>Means of Delivery</name>
</issue-custom-field>
<issue-custom-field>
<id>1002</id>
<name>Shipping Date</name>
</issue-custom-field>
</issue-custom-fields>
<issues type="array">
<issue>
<id type="integer">100</id>
<project-id type="integer">10</project-id>
<subject>first helpdesk issue</subject>
<description>a small problem</description>
<custom-values>
<custom-value>
<custom-field-id>1000</custom-field-id>
<value>15</value>
</custom-value>
<custom-value>
<custom-field-id>1002</custom-field-id>
<value>2016-08-01</value>
</custom-value>
</custom-values>
</issue>
<issue>
<id type="integer">101</id>
<project-id type="integer">10</project-id>
<subject>second helpdesk issue</subject>
<description>a medium problem</description>
<custom-values>
<custom-value>
<custom-field-id>1000</custom-field-id>
<value>10</value>
</custom-value>
<custom-value>
<custom-field-id>1001</custom-field-id>
<value>FTP</value>
</custom-value>
</custom-values>
</issue>
<issue>
<id type="integer">102</id>
<project-id type="integer">10</project-id>
<subject>third helpdesk issue</subject>
<description>a huge security problem</description>
<custom-values>
<custom-value>
<custom-field-id>1001</custom-field-id>
<value>SSH</value>
</custom-value>
</custom-values>
</issue>
<issue>
<id type="integer">103</id>
<project-id type="integer">20</project-id>
<subject>first "development" issue</subject>
<description>just some "strange" software</description>
<custom-values>
</custom-values>
</issue>
</issues>
</xml_data>
非常感谢你的帮助。
答案 0 :(得分：1)
如果我理解正确，你想做：
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" encoding="UTF-8"/>
<xsl:key name="custom-value" match="custom-value" use="concat(custom-field-id, '|', ancestor::issue/id)" />
<xsl:template match="/xml_data">
<xsl:variable name="custom-fields" select="issue-custom-fields/issue-custom-field" />
<!-- header -->
<!-- standard fields -->
<xsl:for-each select="issues/issue[1]/*[not(self::custom-values)]">
<xsl:value-of select="name()"/>
<xsl:text>,</xsl:text>
</xsl:for-each>
<!-- custom fields -->
<xsl:for-each select="$custom-fields">
<xsl:value-of select="name"/>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text> </xsl:text>
<!-- data -->
<xsl:for-each select="issues/issue">
<xsl:variable name="issue-id" select="id" />
<!-- standard fields -->
<xsl:for-each select="*[not(self::custom-values)]">
<xsl:value-of select="."/>
<xsl:text>,</xsl:text>
</xsl:for-each>
<!-- custom fields -->
<xsl:for-each select="$custom-fields">
<xsl:value-of select="key('custom-value', concat(id, '|', $issue-id))/value"/>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text> </xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
应用于您的输入示例，结果将是：
id,project-id,subject,description,Delay,Means of Delivery,Shipping Date
100,10,first helpdesk issue,a small problem,15,,2016-08-01
101,10,second helpdesk issue,a medium problem,10,FTP,
102,10,third helpdesk issue,a huge security problem,,SSH,
103,20,first "development" issue,just some "strange" software,,,