XPath 按值引用属性？

问题描述

我需要通过 XPath 查询从我在页面末尾报告的 XML 文件中提取一系列值。

特别是，我试图找到一个查询，它允许我使用属性本身的命名来选择与属性相关的值。

我可以通过以下查询，读取第一个、第二个、第三个属性等的值。

 //m:Meta[15]/@value

问题是在 XML 文件中这些位置可以改变，所以我并不总是得到所需的值。

例如，我需要始终引用 "Ragione Sociale Destinatario" 属性的数据，但有时它占据位置 15，有时占据位置 16。

我正在寻找的查询类似于

//m:Meta[name='Ragione Sociale Destinatario']

即必须得到写入“connected”values属性中的数据。明确地说，第一个元素是SIEM SPA，第二个元素是DML spa，依此类推

你能帮我举一个正确语法的例子吗？

<?xml version="1.0" encoding="UTF-8"?>
<IdC xmlns="http://www.uni.com/U3011/sincro/" xmlns:s="http://www.uni.com/U3011/sincro/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.uni.com/U3011/sincro/ UNI1138600_2010_EIT.xsd http://andxor.it/tDoc/lotto.xsd lotto.xsd http://andxor.it/tDoc/Metadata.xsd Metadata.xsd">
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    <ID s:scheme="local">1610960618898</ID>
    <CreatingApplication>
      <Name>tDoc</Name>
      <Version>r27212</Version>
      <Producer>Andxor Soluzioni informatiche srl</Producer>
    </CreatingApplication>
    <MoreInfo s:XMLScheme="http://andxor.it/tDoc/lotto.xsd">
      <EmbeddedMetadata>
        <lotto xmlns="http://andxor.it/tDoc/lotto.xsd">
          <company>IT08767050969</company>
          <doctype>FattureEmesse</doctype>
          <period>2020</period>
          <prevIoUs id="1610790947210">DDFCC019EEA10ECCCF4FC64E2D499CA3D757D6CC31523EB0813FE96F08694277</prevIoUs>
        </lotto>
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            <m:Meta class="internal" name="PdV" value="w3JpQzRYzt7"/>
            <m:Meta name="Controllo Sequenza" value="15065"/>
            <m:Meta name="Tipo Postalizzazione" value="Fattura Elettronica B2B"/>
            <m:Meta name="Notifica Ricevuta Consegna" value="Ricevuta Consegna"/>
            <m:Meta name="Esito Processo" value="OK"/>
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            <m:Meta name="Partita IVA Mittente" value="08767050969"/>
            <m:Meta name="Ragione Sociale Mittente" value="BIGBEN INteraCTIVE SRL"/>
            <m:Meta name="Partita IVA Destinatario" value="05660991000"/>
            <m:Meta name="Codice Fiscale Destinatario" value="01017000710"/>
            <m:Meta name="Ragione Sociale Destinatario" value="SIEM SPA"/>
            <m:Meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
            <m:Meta name="Indirizzo PEC" value="siemspa_raccomandate@corporate.mailcert.it"/>
            <m:Meta name="Identificativo SDI" value="4237523569"/>
            <m:Meta name="Data Ora Ricezione" value="20201219022540"/>
            <m:Meta name="Ora Ricevuta Consegna" value="022551"/>
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            <m:Meta name="Controllo Sequenza" value="15116"/>
            <m:Meta name="Tipo Postalizzazione" value="Fattura Elettronica B2B"/>
            <m:Meta name="Notifica Ricevuta Consegna" value="Ricevuta Consegna"/>
            <m:Meta name="Esito Processo" value="OK"/>
            <m:Meta name="Data Documento" value="18-12-2020"/>
            <m:Meta name="Data Ricevuta Consegna" value="19-12-2020"/>
            <m:Meta name="ID Univoco" value="23054929031"/>
            <m:Meta name="Numero Documento" value="FV-202015116"/>
            <m:Meta name="Sezionale" value="2020"/>
            <m:Meta name="Partita IVA Mittente" value="08767050969"/>
            <m:Meta name="Ragione Sociale Mittente" value="BIGBEN INteraCTIVE SRL"/>
            <m:Meta name="Partita IVA Destinatario" value="08973230967"/>
            <m:Meta name="Ragione Sociale Destinatario" value="AMAZON EU SARL,SUCCURSALE ITALIANA"/>
            <m:Meta name="Codice Fatturazione Elettronica" value="XR6XN0E"/>
            <m:Meta name="Indirizzo PEC" value="amazoneu@legalmail.it"/>
            <m:Meta name="Identificativo SDI" value="4237524523"/>
            <m:Meta name="Data Ora Ricezione" value="20201219022631"/>
            <m:Meta name="Ora Ricevuta Consegna" value="022652"/>
            <m:Meta name="Ultima Modifica" value="2020-12-19T02:28:54.463Z"/>
          </m:Metadata>
        </EmbeddedMetadata>
      </MoreInfo>
    </File>
  </FileGroup>
  <Process>
    <Agent s:type="organization" s:role="PreservationManager">
      <AgentName>
        <FormalName>TESI SpA (Responsabile Conservazione)</FormalName>
      </AgentName>
      <Agent_ID s:scheme="TaxCode">02448510046</Agent_ID>
    </Agent>
    <Agent s:type="person" s:role="PreservationManager">
      <AgentName>
        <NameAndSurname>
          <FirstName>Giuseppe</FirstName>
          <LastName>Crivello</LastName>
        </NameAndSurname>
      </AgentName>
      <Agent_ID s:scheme="TaxCode">CRVGPP69B20B791G</Agent_ID>
    </Agent>
    <Agent s:type="person" s:role="OtherRole" s:otherRole="Altro ruolo">
      <AgentName>
        <NameAndSurname>
          <FirstName>Amministratore</FirstName>
          <LastName>root</LastName>
        </NameAndSurname>
      </AgentName>
      <Agent_ID s:scheme="TaxCode"></Agent_ID>
    </Agent>
    <TimeReference>
      <TimeInfo>2021-01-18T10:03:38+01:00</TimeInfo>
    </TimeReference>
    <LawAndRegulations s:language="it">DPCM 3 dicembre 2013</LawAndRegulations>
  </Process>
</IdC>

解决方法

在 XPath 中，属性用前导 @ 字符指定。

此外，XPath 对格式良好的 XML 文档进行操作。你的不是：最后一个 File 元素缺少它的开始标签。

所以，一旦你修复了你的 XML，这个 XPath，

//m:meta[@name="Ragione Sociale Destinatario"]/@value

将根据请求返回 value 属性为 m:meta 的 name 元素的 "Ragione Sociale Destinatario" 属性，无论位置如何。

请注意，您还必须定义 m 命名空间前缀与其关联的命名空间 URI 之间的绑定。见How does XPath deal with XML namespaces?

xml xml xml xml xml xml xml xml-namespaces xpath xpath xpath xpath