使用 XPath 查询读取和选择 XML 标记

【问题标题】：Reading and select XML tags with XPath query使用 XPath 查询读取和选择 XML 标记
【发布时间】：2020-05-14 09:34:24
【问题描述】：

我需要通过 XPath 查询从我在页面末尾报告的 XML 文件中推断出一系列值。

特别感谢在上一个问题中收到的指示，由于我在应用程序中使用了以下查询，我有可能推断出我感兴趣的所有值：

标签 IdC 的值 -> SelfDescription -> ID with:

/ * [Name () = 'IdC'] / * [name () = 'SelfDescription'] / * [name () = 'ID']

“路径”标签中包含的值：

// * [name () = 'Path']

有输出

docs / 002D4DC0.pdf
docs / 002D4DC2.pdf
docs / 002D4DC4.pdf
docs / 002D4DC6.pdf

等等..

TAGs“值”的不同值指的是相关组

"<File s: format =" application / pdf ">"

基于索引 1,2,3 与：

// m: meta [1] / @ value
// m: meta [2] / @ value

等等..

带输出（示例）

2019-05-06 
2019-05-07
...

或

9102154402
9102154403
....

然后我可以通过 SQL 中的其他查询来输出一个表，该表以所需的形式返回列中的数据，例如：

ID            Path                   Value1                  Value2
1558224025077 docs / 002D4DC0.pdf    2019-05-06            9102154402
1558224025077 docs / 002D4DC2.pdf    2019-05-07            9102154403

等等..

我的问题是，在程序的第一阶段读取 XML 的应用程序，使用上述表达式，每次只能处理有限数量的值，因此，当 XML 包含大量数据，我的最终输出不完整。

表达是可以成功的

// * [name () = 'Path']
// m: meta [1] / @ value

或其他适当的函数 Xpath

以便它们只对 XML 中存在的一系列标签进行操作，例如从 1 到 100，然后从 101 到 200 等等..？

我尝试使用“位置”功能，例如通过写作

 / / * [name () = 'Path'] [position (> 10)]

或类似的，

但我没有得到想要的结果。据我了解，所有值都在位置= 1中考虑。 如果我写在前面的表达式[position (= 1)] 我得到所有 XML“路径”值，否则如果我写例如[position (&gt; 1)]

我没有发现任何价值。有解决办法吗？

在此先感谢能帮助我的人。

XML 示例

<?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">1558224025077</ID>
    <CreatingApplication>
      <Name>tDoc</Name>
      <Version>r16610</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>SCOTT</company>
          <doctype>FATTURE_PASSIVE</doctype>
          <period>2019</period>
          <previous id="1557187238227">60AECF9413EE8D53F2238C03D8271670C5761FC5AEE92951966D3BE31FC192E2</previous>
        </lotto>
      </EmbeddedMetadata>
    </MoreInfo>
  </SelfDescription>
  <VdC>
    <ID s:scheme="local">1558224025077</ID>
  </VdC>
  <FileGroup xmlns:m="http://andxor.it/tDoc/metadata.xsd">
    <File s:format="application/pdf">
      <ID s:scheme="local">2969024</ID>
      <Path>docs/002D4DC0.pdf</Path>
      <Hash s:function="SHA-256">CCB149AA3C63F4B7519A49E0453742FFC63E85CD44DC458BB094D0682A053E40</Hash>
      <MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
        <EmbeddedMetadata>
          <m:metadata>
            <m:meta class="internal" name="Data inserimento" value="2019-05-06T19:40:11+02:00"/>
            <m:meta name="Data" value="2019-04-30"/>
            <m:meta name="Ragione Sociale" value="SCOTT ITALIA S.R.L."/>
            <m:meta name="Codice Cliente" value="200009"/>
            <m:meta name="Partita Iva" value="IT03770200164"/>
            <m:meta name="Numero Protocollo" value="9102154398"/>
          </m:metadata>
        </EmbeddedMetadata>
      </MoreInfo>
    </File>
    <File s:format="application/pdf">
      <ID s:scheme="local">2969026</ID>
      <Path>docs/002D4DC2.pdf</Path>
      <Hash s:function="SHA-256">8005A54C5D12219295B3E16CD28A93C3CDB9C9DA67630E20F8DAB749DADF1F56</Hash>
      <MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
        <EmbeddedMetadata>
          <m:metadata>
            <m:meta class="internal" name="Data inserimento" value="2019-05-06T19:40:13+02:00"/>
            <m:meta name="Data" value="2019-04-30"/>
            <m:meta name="Ragione Sociale" value="SCOTT ITALIA S.R.L."/>
            <m:meta name="Codice Cliente" value="200009"/>
            <m:meta name="Partita Iva" value="IT03770200164"/>
            <m:meta name="Numero Protocollo" value="9102154402"/>
          </m:metadata>
        </EmbeddedMetadata>
      </MoreInfo>
    </File>
    <File s:format="application/pdf">
      <ID s:scheme="local">2969028</ID>
      <Path>docs/002D4DC4.pdf</Path>
      <Hash s:function="SHA-256">4B516C97B13D5FC7C4D13B27CD08C3B7238292CA19B922EACA002FC3EA5648FF</Hash>
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        <EmbeddedMetadata>
          <m:metadata>
            <m:meta class="internal" name="Data inserimento" value="2019-05-06T19:40:15+02:00"/>
            <m:meta name="Data" value="2019-04-30"/>
            <m:meta name="Ragione Sociale" value="SCOTT ITALIA S.R.L."/>
            <m:meta name="Codice Cliente" value="200009"/>
            <m:meta name="Partita Iva" value="IT03770200164"/>
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    <File s:format="application/pdf">
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      <Path>docs/002D57C9.pdf</Path>
      <Hash s:function="SHA-256">70FECF3F3186552114D14AF57829BE76AA6F0FFC3473F620F2CA0B9B00E74712</Hash>
      <MoreInfo s:XMLScheme="http://andxor.it/tDoc/metadata.xsd">
        <EmbeddedMetadata>
          <m:metadata>
            <m:meta class="internal" name="Data inserimento" value="2019-05-13T20:59:11+02:00"/>
            <m:meta name="Data" value="2019-05-13"/>
            <m:meta name="Ragione Sociale" value="SCOTT ITALIA S.R.L."/>
            <m:meta name="Codice Cliente" value="200010"/>
            <m:meta name="Partita Iva" value="IT03770200164"/>
            <m:meta name="Numero Protocollo" value="9102164890"/>
          </m:metadata>
        </EmbeddedMetadata>
      </MoreInfo>
    </File>
  </FileGroup>
  <Process>
    <Agent s:type="organization" s:role="PreservationManager">
      <AgentName>
        <FormalName>KPNQwest Italia SpA</FormalName>
      </AgentName>
      <Agent_ID s:scheme="TaxCode">07957860153</Agent_ID>
    </Agent>
    <Agent s:type="person" s:role="PreservationManager">
      <AgentName>
        <NameAndSurname>
          <FirstName>Giuseppe</FirstName>
          <LastName>Baccanelli</LastName>
        </NameAndSurname>
      </AgentName>
      <Agent_ID s:scheme="TaxCode">BCCGPP64C01A940D</Agent_ID>
    </Agent>
    <Agent s:type="person" s:role="PreservationManager">
      <AgentName>
        <NameAndSurname>
          <FirstName>Giuseppe</FirstName>
          <LastName>Baccanelli</LastName>
        </NameAndSurname>
      </AgentName>
      <Agent_ID s:scheme="TaxCode">BCCGPP64C01A940D</Agent_ID>
    </Agent>
    <Agent s:type="organization" s:role="OtherRole" s:otherRole="Other role">
      <AgentName>
        <FormalName>Amministratore</FormalName>
      </AgentName>
    </Agent>
    <TimeReference>
      <TimeInfo>2019-05-19T02:00:25+02:00</TimeInfo>
    </TimeReference>
    <LawAndRegulations s:language="it">DPCM 3 dicembre 2013</LawAndRegulations>
  </Process>
</IdC>

【问题讨论】：

    标签： xml xpath


    【解决方案1】：

    您的 XPath 语法错误。您应该在选择器的第一部分周围使用()，并正确声明position()：

    (//*[name()="Path"])[position()>9 and position()<21]

    使用您的示例数据，这将从第 10 位到第 20 位选择 Path 元素。

    【讨论】：

    • 早上好，它工作得很好，谢谢你非常有用的指示，再见
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