如何在不改动现有XSLT逻辑前提下处理XML转JSON的空标签输出

核心要求：

• 不干扰现有XSLT代码的业务逻辑
• 空标签按预期JSON格式输出：空文本节点输出为""，指定列表节点输出为空数组[]
• 仅保留预期JSON中定义的参数

输入XML文件 #

<?xml version="1.0" encoding="UTF-8"?>
<ns0:PO_Record
    xmlns:ns0="http://Test.com/Order">
    <domainId>TEST</domainId>
    <hubDomainId>TEST</hubDomainId>
    <isForReference>false</isForReference>
    <status>Ok</status>
    <docStatus>Success</docStatus>
    <editingStatus>confirmed</editingStatus>
    <vpoNo>10000341</vpoNo>
    <vpoDate>2021-03-05</vpoDate>
    <instructions></instructions>
    <businessRefNo>10000341</businessRefNo>
    <totalItems>0</totalItems>
    <totalQty>0</totalQty>
    <customFields>
        <customFieldDate1>2042-01-21</customFieldDate1>
    </customFields>
    <season>
        <code>F22</code>
    </season>
    <custId>
        <custCode>TEST</custCode>
        <refNo>002001</refNo>
    </custId>
    <vendorId>
        <vendorCode>1235</vendorCode>
    </vendorId>
    <vpoItemList></vpoItemList>
    <vpoShipDtlDtoGroupList></vpoShipDtlDtoGroupList>    
    <vpoShipDtlCsGroupList></vpoShipDtlCsGroupList>
</ns0:PO_Record>

预期输出JSON格式 #

{
    "domainId": "TEST",
    "hubDomainId": "TEST",
    "isForReference": "false",
    "status": "Ok",
    "docStatus": "Success",
    "editingStatus": "confirmed",
    "vpoNo": "10000341",
    "vpoDate": "2021-03-05",
    "instructions": "",
    "businessRefNo": "10000341",
    "totalItems": "0",
    "totalQty": "0",
    "customFields": {
        "customFieldDate1": "2042-01-21"
    },
    "season": {
        "code": "F22"
    },
    "custId": {
        "custCode": "TEST",
        "refNo": "002001"
    },
    "vendorId": {
        "vendorCode": "1235"
    },
    "vpoItemList": [],
    "vpoShipDtlDtoGroupList": [],
    "vpoShipDtlCsGroupList": []
}

兼容原有逻辑的XSLT代码 #

仅新增1个空列表节点匹配模板，原有业务逻辑完全保留：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="#all"
    xmlns="http://www.w3.org/2005/xpath-functions"
    expand-text="yes"
    version="3.0">

  <xsl:output method="text"/>

  <xsl:template match="/">
      <xsl:variable name="json-xml">
          <xsl:apply-templates/>
      </xsl:variable>
      <xsl:value-of select="xml-to-json($json-xml, map { 'indent' : true() })"/>
  </xsl:template>
  
  <!-- 新增模板：匹配空的指定列表节点，生成空数组 -->
  <xsl:template match="vpoItemList | vpoItemCsList | vpoShipDtlDtoGroupList | vpoShipDtlCsGroupList[not(*)]">
    <array key="{local-name()}"/>
  </xsl:template>
  
  <xsl:template match="*[not(*)]">
    <string key="{local-name()}">{.}</string>
  </xsl:template>
  
  <xsl:template match="*[(*) and . castable as xs:double]">
    <number key="{local-name()}">{.}</number>
  </xsl:template>
  
   <xsl:template match="*[*]">
    <xsl:param name="key" as="xs:boolean" select="false()"/>
    <map>
      <xsl:if test="$key">
        <xsl:attribute name="key" select="local-name()"/>
      </xsl:if>
      <xsl:for-each-group select="*" group-by="node-name()">
          <xsl:choose>
              <xsl:when test="current-group()[2] or self::vpoItemList or self::vpoItemCsList or self::vpoShipDtlDtoGroupList or self::vpoShipDtlCsGroupList">
                  <array key="{local-name()}">
                    <xsl:choose>
                      <xsl:when test="self::vpoShipDtlDtoGroupList">
                        <array>
                          <xsl:apply-templates select="current-group()">
                            <xsl:with-param name="key" select="false()"/>
                          </xsl:apply-templates>                        
                        </array>
                      </xsl:when>
                      <xsl:when test="self::vpoShipDtlCsGroupList">
                        <xsl:for-each-group select="current-group()" group-by="itemLotNo">
                          <array>
                            <xsl:apply-templates select="current-group()">
                              <xsl:with-param name="key" select="false()"/>
                            </xsl:apply-templates>
                          </array>
                        </xsl:for-each-group>
                      </xsl:when>
                      <xsl:otherwise>
                        <xsl:apply-templates select="current-group()">
                          <xsl:with-param name="key" select="false()"/>
                        </xsl:apply-templates>
                      </xsl:otherwise>                      
                    </xsl:choose>
                  </array>
              </xsl:when>
              <xsl:otherwise>
                  <xsl:apply-templates select="current-group()">
                    <xsl:with-param name="key" select="true()"/>
                  </xsl:apply-templates>
              </xsl:otherwise>
          </xsl:choose>
      </xsl:for-each-group>
    </map>
  </xsl:template>
</xsl:stylesheet>

调整说明 #

• 新增模板优先级高于原有通用模板，只会匹配指定的空列表节点，不会影响其他节点的转换逻辑
• 空文本节点（如<instructions></instructions>）由原有模板自动输出为""，符合预期
• 输出字段完全匹配预期JSON范围，无冗余内容

内容的提问来源于stack exchange，提问作者raviteja