XPath 按值引用属性？
XPath to reference an attribute by value?
我需要通过 XPath 查询从 XML 个文件中提取一系列值，我在页面末尾报告。
特别是，我试图找到一个查询，允许我使用属性本身的命名 select 与属性相关的值。
我可以通过下面的查询，读取第一、第二、第三属性等的值。
//m:meta[15]/@value
问题是在 XML 文件中这些位置可以改变，所以我并不总能得到想要的值。
比如我需要的数据总是引用"Ragione Sociale Destinatario"属性，但有时它占位置15，有时占位置16。
我正在寻找的查询类似于
//m:meta[name='Ragione Sociale Destinatario']
那一定要获取写在“connected”values属性中的数据。
要清楚，对于第一个元素是SIEM SPA，对于第二个元素是DML spa，等等
你能帮我举个正确语法的例子吗？
<?xml version="1.0" encoding="UTF-8"?>
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<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"/>
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<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>
在 XPath 中，属性是用前导 @ 字符指定的。
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 元素缺少开始标记。
所以，一旦你修复了你的 XML，这个 XPath，
//m:meta[@name="Ragione Sociale Destinatario"]/@value
将 return m:meta 元素的 value 属性，其 name 属性为 "Ragione Sociale Destinatario"，无论位置如何，如所要求的。
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。参见
我需要通过 XPath 查询从 XML 个文件中提取一系列值，我在页面末尾报告。
特别是，我试图找到一个查询，允许我使用属性本身的命名 select 与属性相关的值。
我可以通过下面的查询，读取第一、第二、第三属性等的值。
//m:meta[15]/@value
问题是在 XML 文件中这些位置可以改变，所以我并不总能得到想要的值。
比如我需要的数据总是引用"Ragione Sociale Destinatario"属性，但有时它占位置15，有时占位置16。
我正在寻找的查询类似于
//m:meta[name='Ragione Sociale Destinatario']
那一定要获取写在“connected”values属性中的数据。
要清楚，对于第一个元素是SIEM SPA，对于第二个元素是DML spa，等等
你能帮我举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">
<SelfDescription>
<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>
</EmbeddedMetadata>
</MoreInfo>
</SelfDescription>
<VdC>
<ID s:scheme="local">1610960618898</ID>
</VdC>
<FileGroup xmlns:m="http://andxor.it/tDoc/metadata.xsd">
<File s:format="text/xml">
<ID s:scheme="local">281487958</ID>
<Path>docs/23054927031.xml</Path>
<Hash s:function="SHA-256">F3D97E78EAC886325E755851E5BAE0E5702A1712ED7B83DFEF5F5FFE66899F04</Hash>
<MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
<EmbeddedMetadata>
<m:metadata>
<m:meta class="internal" name="Data inserimento" value="2020-12-18T18:22:21+01:00"/>
<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"/>
<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="23054927031"/>
<m:meta name="Numero Documento" value="FV-202015065"/>
<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="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"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:16.290Z"/>
</m:metadata>
</EmbeddedMetadata>
</MoreInfo>
</File>
<File s:format="text/xml">
<ID s:scheme="local">281487962</ID>
<Path>docs/23054927071.xml</Path>
<Hash s:function="SHA-256">F0C2B4F3B5143AD145EF6FD446FCFEF0A6AD9526B3A88E6A7026089AEC728D4F</Hash>
<MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
<EmbeddedMetadata>
<m:metadata>
<m:meta class="internal" name="Data inserimento" value="2020-12-18T18:22:21+01:00"/>
<m:meta class="internal" name="PdV" value="w3JpQzRYzt7"/>
<m:meta name="Controllo Sequenza" value="15078"/>
<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="23054927071"/>
<m:meta name="Numero Documento" value="FV-202015078"/>
<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="02106250398"/>
<m:meta name="Ragione Sociale Destinatario" value="DML SPA"/>
<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523575"/>
<m:meta name="Data Ora Ricezione" value="20201219022541"/>
<m:meta name="Ora Ricevuta Consegna" value="022549"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:06.930Z"/>
</m:metadata>
</EmbeddedMetadata>
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<EmbeddedMetadata>
<m:metadata>
<m:meta class="internal" name="Data inserimento" value="2020-12-18T18:22:22+01:00"/>
<m:meta class="internal" name="PdV" value="w3JpQzRYzt7"/>
<m:meta name="Controllo Sequenza" value="15080"/>
<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="Data Ricevuta Consegna" value="19-12-2020"/>
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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="02106250398"/>
<m:meta name="Ragione Sociale Destinatario" value="DML SPA"/>
<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523580"/>
<m:meta name="Data Ora Ricezione" value="20201219022541"/>
<m:meta name="Ora Ricevuta Consegna" value="022548"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:05.336Z"/>
</m:metadata>
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<EmbeddedMetadata>
<m:metadata>
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<m:meta class="internal" name="PdV" value="w3JpQzRYzt7"/>
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<m:meta name="Partita IVA Destinatario" value="02106250398"/>
<m:meta name="Ragione Sociale Destinatario" value="DML SPA"/>
<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523592"/>
<m:meta name="Data Ora Ricezione" value="20201219022542"/>
<m:meta name="Ora Ricevuta Consegna" value="022550"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:10.305Z"/>
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<EmbeddedMetadata>
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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="02106250398"/>
<m:meta name="Ragione Sociale Destinatario" value="DML SPA"/>
<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523608"/>
<m:meta name="Data Ora Ricezione" value="20201219022543"/>
<m:meta name="Ora Ricevuta Consegna" value="022550"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:08.446Z"/>
</m:metadata>
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<m:meta name="Partita IVA Destinatario" value="02106250398"/>
<m:meta name="Ragione Sociale Destinatario" value="DML SPA"/>
<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523613"/>
<m:meta name="Data Ora Ricezione" value="20201219022543"/>
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<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
<m:meta name="Identificativo SDI" value="4237523636"/>
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<m:meta name="Codice Fatturazione Elettronica" value="HHBD9AK"/>
<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
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<m:meta name="Indirizzo PEC" value="Sede.dml-italia@legpec.it"/>
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<m:meta name="Data Ora Ricezione" value="20201219022546"/>
<m:meta name="Ora Ricevuta Consegna" value="022604"/>
<m:meta name="Ultima Modifica" value="2020-12-19T02:28:29.618Z"/>
</m:metadata>
</EmbeddedMetadata>
</MoreInfo>
</File>
<ID s:scheme="local">281488232</ID>
<Path>docs/23054929031.xml</Path>
<Hash s:function="SHA-256">96DF0E38DB51D5D6637CDAFFC9E8E585D6308EC8D16A4F71C690BAD0837888F1</Hash>
<MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
<EmbeddedMetadata>
<m:metadata>
<m:meta class="internal" name="Data inserimento" value="2020-12-18T18:22:47+01:00"/>
<m:meta class="internal" name="PdV" value="w3JpQzRYzt7"/>
<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>
在 XPath 中，属性是用前导 @ 字符指定的。
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 元素缺少开始标记。
所以，一旦你修复了你的 XML，这个 XPath，
//m:meta[@name="Ragione Sociale Destinatario"]/@value
将 return m:meta 元素的 value 属性，其 name 属性为 "Ragione Sociale Destinatario"，无论位置如何，如所要求的。
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。参见