Question

在快速矿工中我试图从xml页面使用xpath获取数据，我尝试了许多不同的语句但没有成功。下面是我试图检索的数据，我想要无序列表中的所有功能。

enter code here

<div id="features">
<h3>Features:</h3>
<ul><li>Front  garden</li>
<li>Rear Large Shed</li>
<li>Superb condition and tastefully decorated</li>
<li>Energy Efficent with a B2 Ber rating</li>
<li>Gravel &amp; driveway</li>
</ul></div>

Answer 1

假设你想要一系列字符串，那么就有了快捷的方法：

//li/string()

具体方式：

/div[@id='features']/ul/li/string()

Answer 2

你没有真正说明你需要如何提取这些数据或它的发展方向，但这可能会有所帮助：

我保存了你的示例xml，如下所示：

<?xml version="1.0" encoding="utf-8" ?>
<div id="features"> 
<h3>Features:</h3>
<ul><li>Front  garden</li>
<li>Rear Large Shed</li>
<li>Superb condition and tastefully decorated</li>
<li>Energy Efficent with a B2 Ber rating</li>
<li>Gravel &amp; driveway</li>
</ul></div>

然后我创建了以下RapidMiner进程，该进程将每个列表元素作为单独的属性提取：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.005">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.005" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="read_xml" compatibility="5.3.005" expanded="true" height="60" name="Read XML" width="90" x="112" y="165">
        <parameter key="file" value="path/to/Test.xml"/>
        <parameter key="xpath_for_examples" value="//h3"/>
        <enumeration key="xpaths_for_attributes">
          <parameter key="xpath_for_attribute" value="//li[1]/text()"/>
          <parameter key="xpath_for_attribute" value="//li[2]/text()"/>
          <parameter key="xpath_for_attribute" value="//li[3]/text()"/>
          <parameter key="xpath_for_attribute" value="//li[4]/text()"/>
          <parameter key="xpath_for_attribute" value="//li[5]/text()"/>
        </enumeration>
        <list key="namespaces"/>
        <parameter key="use_default_namespace" value="false"/>
        <list key="annotations"/>
        <list key="data_set_meta_data_information"/>
      </operator>
      <connect from_op="Read XML" from_port="output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

我认为您正在寻找的XPATH查询是“// li [n] / text（）”，其中n是您尝试从中提取数据的节点的编号。我希望这有帮助！

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2 个答案: