删除由XSL创建的空节点

Question

我想删除一个由xsl创建的元素。我正在检查创建元素后的子元素。例如

<projectRisks>    (element to be removed if it empty after creation)
 <for-each risk>
  <if riskid=projid >
      COPY RISK
  </if >
 </foreach>
<projectRisks>

完成此操作后，如果projectRisks没有子项目，则需要删除它。我尝试了这里提供的所有解决方案。但是，由于在xsl中创建了projectRisks，因此无法删除它。

这里我提供了示例XML

 <addProjectDetail>
<uniqueProjectId>142</uniqueProjectId>
</addProjectDetail>
<addProjectDetail>
<uniqueProjectId>915</uniqueProjectId>
</addProjectDetail>
<addProjectDetail>
<uniqueProjectId>100</uniqueProjectId>
</addProjectDetail>
  <addProjectRisks>
    <addProjectRisk>
        <uniqueProjectId>142</uniqueProjectId>
        <agencyProjectRiskId>852</agencyProjectRiskId>              
    </addProjectRisk>
   <addProjectRisk>
    <uniqueProjectId>915</uniqueProjectId>
    <agencyProjectRiskId>853</agencyProjectRiskId>  
    </addProjectRisk>   
   </addProjectRisks>

生成的xml看起来像

   <addProjectDetail>
   <uniqueProjectId>142</uniqueProjectId>
      </addProjectDetail>
<addProjectRisks>
    <addProjectRisk>
        <uniqueProjectId>142</uniqueProjectId>
        <agencyProjectRiskId>852</agencyProjectRiskId>              
    </addProjectRisk>
</addProjectRisks>
<addProjectDetail>
<uniqueProjectId>915</uniqueProjectId>
</addProjectDetail>
<addProjectRisks>
    <addProjectRisk>
        <uniqueProjectId>915</uniqueProjectId>
         <agencyProjectRiskId>853</agencyProjectRiskId>             
    </addProjectRisk>
</addProjectRisks>
 <addProjectDetail>
<uniqueProjectId>100</uniqueProjectId>
</addProjectDetail>

在上面的xml中，有3个代码，142,915和100。142和915有2个风险，100没有风险所以对于100，它不应该创建addprojectrrisks元素

Answer 1

您可以使用此转换，我使用了模式，以便简化当前(未显示)样式表中的集成:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes" indent="yes"/>
    <xsl:strip-space elements="*"/>
    <xsl:key name="ProjectRiskById" match="addProjectRisk" use="uniqueProjectId"/>
    <xsl:template match="addProjectDetail">
        <xsl:copy-of select="."/>
        <xsl:apply-templates select="key('ProjectRiskById',uniqueProjectId)[1]" 
            mode="add"/>
    </xsl:template>
    <xsl:template match="addProjectRisk" mode="add">
        <addProjectRisks>
            <xsl:copy-of select="key('ProjectRiskById',uniqueProjectId)"/>
        </addProjectRisks>
    </xsl:template>
    <xsl:template match="text()"/>
</xsl:stylesheet>

当应用于以下输入示例时(通过添加最顶部元素使其格式良好，并使其覆盖更多情况):

<xml>
    <addProjectDetail>
        <uniqueProjectId>142</uniqueProjectId>
    </addProjectDetail>
    <addProjectDetail>
        <uniqueProjectId>915</uniqueProjectId>
    </addProjectDetail>
    <addProjectDetail>
        <uniqueProjectId>100</uniqueProjectId>
    </addProjectDetail>
    <addProjectRisks>
        <addProjectRisk>
            <uniqueProjectId>142</uniqueProjectId>
            <agencyProjectRiskId>852</agencyProjectRiskId>              
        </addProjectRisk>
        <addProjectRisk>
            <uniqueProjectId>915</uniqueProjectId>
            <agencyProjectRiskId>853</agencyProjectRiskId>  
        </addProjectRisk>   
                <addProjectRisk>
            <uniqueProjectId>915</uniqueProjectId>
            <agencyProjectRiskId>857</agencyProjectRiskId>  
        </addProjectRisk> 
    </addProjectRisks>
</xml>

产生如下片段:

<addProjectDetail>
   <uniqueProjectId>142</uniqueProjectId>
</addProjectDetail>
<addProjectRisks>
   <addProjectRisk>
      <uniqueProjectId>142</uniqueProjectId>
      <agencyProjectRiskId>852</agencyProjectRiskId>
   </addProjectRisk>
</addProjectRisks>
<addProjectDetail>
   <uniqueProjectId>915</uniqueProjectId>
</addProjectDetail>
<addProjectRisks>
   <addProjectRisk>
      <uniqueProjectId>915</uniqueProjectId>
      <agencyProjectRiskId>853</agencyProjectRiskId>
   </addProjectRisk>
   <addProjectRisk>
      <uniqueProjectId>915</uniqueProjectId>
      <agencyProjectRiskId>857</agencyProjectRiskId>
   </addProjectRisk>
</addProjectRisks>
<addProjectDetail>
   <uniqueProjectId>100</uniqueProjectId>
</addProjectDetail>