xml - XSLT:根据名称属性删除重复节点

Question

我有下面的输入 XML，需要使用 xslt 进行转换

输入 Xml:

<result>
    <circuit>MX123456</circuit>
    <psaresult>
        <Live_Alarms>
            <diagnosis>
                <utr>xxx</utr>
                <dtr>xxx</dtr>
                <text />
                <site>xxx</site>
                <address />
                <tech_type />
                <end />
                <network_type>xxx</network_type>
            </diagnosis>
            <Alarms>
                <alarmId>463</alarmId>
                <cct>xxx</cct>
                <eventTime>12/05/11 09:21:21</eventTime>
                <clearTime />
                <problemCode>xxxx</problemCode>
                <problemText>xxxx</problemText>
                <equipmentName>xxx</equipmentName>
                <unit>xxx</unit>
                <rcKey>xxx</rcKey>
                <category>xxx</category>
                <rootCause>xxxx</rootCause>
            </Alarms>
            <Alarms>
                <alarmId>464</alarmId>
                <cct>xxx</cct>
                <eventTime>12/05/11 09:21:22</eventTime>
                <clearTime />
                <problemCode>yyyy</problemCode>
                <problemText>yyyy</problemText>
                <equipmentName>yyyy</equipmentName>
                <unit>yyyy</unit>
                <rcKey>yyyy</rcKey>
                <category>yyyy</category>
                <rootCause>yyyy</rootCause>
            </Alarms>
        </Live_Alarms>
    </psaresult>
</result>

预期输出:

<result>
    <circuit>MX123456</circuit>
    <psaresult>
        <Live_Alarms>
            <psadiagnosis>
                <utr>xxx</utr>
                <dtr>xxx</dtr>
                <text />
                <site>xxx</site>
                <address />
                <tech_type />
                <end />
                <network_type>xxx</network_type>
            </psadiagnosis>
            <Alarms>
                <alarmId>463</alarmId>
                <cct>xxx</cct>
                <eventTime>12/05/11 09:21:21</eventTime>
                <clearTime />
                <problemCode>xxxx</problemCode>
                <problemText>xxxx</problemText>
                <equipmentName>xxx</equipmentName>
                <unit>xxx</unit>
                <rcKey>xxx</rcKey>
                <category>xxx</category>
                <rootCause>xxxx</rootCause>
            </Alarms>
        </Live_Alarms>
    </psaresult>
</result>

注意:只需要第一个 Alarms 节点，就像 SelectSinglenode 所做的那样，所有其他节点都需要从输出中截断。您能否建议如何通过 xslt 实现这一点？

Answer 1

这是基于规范身份规则的解决方案:

<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="Alarms[position() >1]"/>
</xsl:stylesheet>

应用于提供的 XML 文档时:

<result>
    <circuit>MX123456</circuit>
    <psaresult>
        <Live_Alarms>
            <diagnosis>
                <utr>xxx</utr>
                <dtr>xxx</dtr>
                <text />
                <site>xxx</site>
                <address />
                <tech_type />
                <end />
                <network_type>xxx</network_type>
            </diagnosis>
            <Alarms>
                <alarmId>463</alarmId>
                <cct>xxx</cct>
                <eventTime>12/05/11 09:21:21</eventTime>
                <clearTime />
                <problemCode>xxxx</problemCode>
                <problemText>xxxx</problemText>
                <equipmentName>xxx</equipmentName>
                <unit>xxx</unit>
                <rcKey>xxx</rcKey>
                <category>xxx</category>
                <rootCause>xxxx</rootCause>
            </Alarms>
            <Alarms>
                <alarmId>464</alarmId>
                <cct>xxx</cct>
                <eventTime>12/05/11 09:21:22</eventTime>
                <clearTime />
                <problemCode>yyyy</problemCode>
                <problemText>yyyy</problemText>
                <equipmentName>yyyy</equipmentName>
                <unit>yyyy</unit>
                <rcKey>yyyy</rcKey>
                <category>yyyy</category>
                <rootCause>yyyy</rootCause>
            </Alarms>
        </Live_Alarms>
    </psaresult>
</result>

产生了完全想要的、正确的结果:

<result>
   <circuit>MX123456</circuit>
   <psaresult>
      <Live_Alarms>
         <diagnosis>
            <utr>xxx</utr>
            <dtr>xxx</dtr>
            <text/>
            <site>xxx</site>
            <address/>
            <tech_type/>
            <end/>
            <network_type>xxx</network_type>
         </diagnosis>
         <Alarms>
            <alarmId>463</alarmId>
            <cct>xxx</cct>
            <eventTime>12/05/11 09:21:21</eventTime>
            <clearTime/>
            <problemCode>xxxx</problemCode>
            <problemText>xxxx</problemText>
            <equipmentName>xxx</equipmentName>
            <unit>xxx</unit>
            <rcKey>xxx</rcKey>
            <category>xxx</category>
            <rootCause>xxxx</rootCause>
         </Alarms>
      </Live_Alarms>
   </psaresult>
</result>

解释:

1. identity rule (模板)“按原样”复制每个节点。

2. 有一个模板覆盖身份规则。它匹配任何不是其父元素的第一个 Alarms 子元素的 Alarms 元素。此模板没有正文——有效地丢弃了任何此类匹配元素，以免被复制到输出中。