如果子节点为空，则删除父节点 [英] Remove parent node if a child node is empty

问题描述

源 XML:

<MP>
  <Name>pol</Name>
  <PRules>
  <PRule order="1" name="r1">
   <Conditions>
    <Condition eleName="eth" value="05">05</Condition>
    <Condition eleName="dest" value="32">32</Condition>
   </Conditions>
  </PRule>
  <PRule order="2" name="r2">
   <Conditions>
    <Condition eleName="eth" value="04">04</Condition>
   </Conditions>
   <Actions>
    <Action name="xyz"/>
   </Actions>
  </PRule>
 </PRules>
</MP>

如果必须删除具有属性 eleName="eth" 的 Condition 节点.如果 Condition 为空，则删除 Condition 节点后，还必须删除完整的 PRule 节点.

If a Condition node with attribute eleName="eth" has to be deleted. After deletion of Condition node if Conditions is empty, complete PRule node also has to be removed.

我已应用以下 XSLT:

I have applied the following XSLT:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="xml" omit-xml-declaration="yes"/>
 <xsl:strip-space elements="*"/>
 <xsl:template match="node()|@*">
  <xsl:copy>
   <xsl:apply-templates select="node()|@*"/>
  </xsl:copy>
 </xsl:template>

 <xsl:template name="attributeTemplate" match="Condition[@elementName='eth']"/>

 <xsl:template match="PRule[descendant::Conditions[not(@*)]]"/>
</xsl:stylesheet>

但结果是这样的:

<MP>
 <Name>pol</Name>
 </PRules>
</MP>

我必须做哪些更改才能将 XML 转换为

What change I have to make to transform the XML as

<MP>
 <Name>pol</Name>
 <PRules>
  <PRule name="r1" order="1">
   <Conditions>
    <Condition eleName="dest" value="32">32</Condition>
   </Conditions>
  </PRule>
 </PRules>
</MP>

xsl 文件出了什么问题，我不明白.基本上，如果条件为空，我想删除父 PRule 节点.

What went wrong in xsl file, I don't understand. Basically I wanted remove the parent PRule node if Conditions is empty.

推荐答案

这种转变:

<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:template match="node()|@*">
     <xsl:copy>
       <xsl:apply-templates select="node()|@*"/>
     </xsl:copy>
 </xsl:template>

 <xsl:template match="PRule[not(*/Condition[not(@eleName='eth')])]"/>

 <xsl:template match="Condition[@eleName = 'eth']"/>
</xsl:stylesheet>

应用于提供的 XML 文档时:

<MP>
    <Name>pol</Name>
    <PRules>
        <PRule order="1" name="r1">
            <Conditions>
                <Condition eleName="eth" value="05">05</Condition>
                <Condition eleName="dest" value="32">32</Condition>
            </Conditions>
        </PRule>
        <PRule order="2" name="r2">
            <Conditions>
                <Condition eleName="eth" value="04">04</Condition>
            </Conditions>
            <Actions>
                <Action name="xyz"/>
            </Actions>
        </PRule>
    </PRules>
</MP>

产生想要的、正确的结果:

<MP>
   <Name>pol</Name>
   <PRules>
      <PRule order="1" name="r1">
         <Conditions>
            <Condition eleName="dest" value="32">32</Condition>
         </Conditions>
      </PRule>
   </PRules>
</MP>

说明:

正确使用身份规则和双重否定法.

Proper use of the identity rule and the double negation law.

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