XSLT过滤需求：移除子节点externalCode为'T'的EmpEmployment节点

问题背景 #

输入XML如下：

<PerNationalId>
    <PerNationalId>
      <nationalId>999.999.868-88</nationalId>
      <personNav>
        <PerPerson>
          <employmentNav>
            <EmpEmployment>
              <empWorkPermitNav>
                <EmpWorkPermit>
                  <documentNumber>27122165960</documentNumber>
                  <issuePlaceNav/>
                  <customString3/>
                  <documentTypeNav>
                    <PicklistOption>
                      <externalCode>6</externalCode>
                    </PicklistOption>
                  </documentTypeNav>
                </EmpWorkPermit>      
              </empWorkPermitNav>
              <jobInfoNav>
                <EmpJob>
                  <emplStatusNav>
                    <PicklistOption>
                      <externalCode>T</externalCode>
                    </PicklistOption>
                  </emplStatusNav>
                  <company>0004</company>
                </EmpJob>
              </jobInfoNav>
              <userId>60020077</userId>
            </EmpEmployment>
            <EmpEmployment>
              <empWorkPermitNav>
                <EmpWorkPermit>
                  <documentNumber>320008725351</documentNumber>
                  <issuePlaceNav/>
                  <customString3/>
                  <documentTypeNav>
                    <PicklistOption>
                      <externalCode>3</externalCode>
                    </PicklistOption>
                  </documentTypeNav>
                </EmpWorkPermit> 
              </empWorkPermitNav>
              <jobInfoNav>
                <EmpJob>
                  <emplStatusNav>
                    <PicklistOption>
                      <externalCode>A</externalCode>
                    </PicklistOption>
                  </emplStatusNav>
                  <company>0004</company>
                </EmpJob>
              </jobInfoNav>
              <userId>20028939</userId>
            </EmpEmployment>
          </employmentNav>
        </PerPerson>
      </personNav>
    </PerNationalId>
  </PerNationalId>

期望输出XML：

<PerNationalId>
    <PerNationalId>
      <nationalId>999.999.868-88</nationalId>
      <personNav>
        <PerPerson>
          <employmentNav>
            <EmpEmployment>
              <empWorkPermitNav>
                <EmpWorkPermit>
                  <documentNumber>320008725351</documentNumber>
                  <issuePlaceNav/>
                  <customString3/>
                  <documentTypeNav>
                    <PicklistOption>
                      <externalCode>3</externalCode>
                    </PicklistOption>
                  </documentTypeNav>
                </EmpWorkPermit> 
              </empWorkPermitNav>
              <jobInfoNav>
                <EmpJob>
                  <emplStatusNav>
                    <PicklistOption>
                      <externalCode>A</externalCode>
                    </PicklistOption>
                  </emplStatusNav>
                  <company>0004</company>
                </EmpJob>
              </jobInfoNav>
              <userId>20028939</userId>
            </EmpEmployment>
          </employmentNav>
        </PerPerson>
      </personNav>
    </PerNationalId>
  </PerNationalId>

核心需求：移除内部子节点路径jobInfoNav/EmpJob/emplStatusNav/PicklistOption/externalCode值等于'T'的EmpEmployment节点。

尝试过的错误XSLT #

之前的代码仅移除了emplStatusNav标签，未达到预期效果：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
 <xsl:strip-space elements="*"/>
 <xsl:template match="@*|node()">
  <xsl:copy>
   <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
 </xsl:template>
 <xsl:template match="/PerNationalId/PerNationalId/personNav/PerPerson/employmentNav/EmpEmployment/jobInfoNav/EmpJob/emplStatusNav/PicklistOption[(externalCode= 'T')]"/>
</xsl:stylesheet>

修正后的XSLT解决方案 #

直接匹配需要移除的EmpEmployment节点，通过条件筛选实现需求：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <!-- 默认复制所有节点和属性的身份转换模板 -->
 <xsl:template match="@*|node()">
  <xsl:copy>
   <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
 </xsl:template>

 <!-- 匹配并移除符合条件的EmpEmployment节点 -->
 <xsl:template match="EmpEmployment[jobInfoNav/EmpJob/emplStatusNav/PicklistOption/externalCode = 'T']"/>
</xsl:stylesheet>

方案说明 #

• 原代码错误地匹配了PicklistOption节点，所以仅移除了该节点而非上级的EmpEmployment。
• 修正后的模板直接定位到EmpEmployment节点，通过谓词[jobInfoNav/EmpJob/emplStatusNav/PicklistOption/externalCode = 'T']筛选出需要移除的目标节点，匹配到的节点不会被复制，从而实现移除整个EmpEmployment的效果。
• 身份转换模板保证了其他无需处理的节点和属性正常保留。

内容的提问来源于stack exchange，提问作者Carlos Moraes