(bash) 如果缺少值，则从 xml 中删除元素

Question

如果缺少某个值，我想删除大 xml 文件中的一些元素。

我找到了一个主题，其中介绍了如何提取存在值的元素，而不是相反的方式。解决方案可以是 sed 或 xmlstartlet，但我想不通。

 xmlstarlet ed -d '//eslXmlDto[.//itemAssociations]' < file1.xml >> file2.xml

这是我的文件

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<screens>
    <screenXmlDto>
        <articleCodeType>EAN</articleCodeType>
        <creationDate>2017-04-25T12:23:18.746+02:00</creationDate>
        <domain>toto.tata</domain>
        <screenCode>16201000032884264000</screenCode>
        <itemAssociations>
            <itemCode>2118550000000</itemCode>
            <position>1</position>
        </itemAssociations>
    </screenXmlDto>
    <screenXmlDto>
        <articleCodeType>EAN</articleCodeType>
        <creationDate>2016-07-27T03:59:17.328+02:00</creationDate>
        <domain>toto.tata</domain>
        <screenCode>17201000030538183370</screenCode>
    </screenXmlDto>
    <screenXmlDto>
        <articleCodeType>EAN</articleCodeType>
        <creationDate>2016-07-26T12:28:20.815+02:00</creationDate>
        <domain>toto.tata</domain>
        <screenCode>17201000030538091000</screenCode>
        <itemAssociations>
            <itemCode>4008033444958</itemCode>
            <position>1</position>
        </itemAssociations>
    </screenXmlDto>
</screens>

这是我想要的输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<screens>
    <screenXmlDto>
        <articleCodeType>EAN</articleCodeType>
        <creationDate>2017-04-25T12:23:18.746+02:00</creationDate>
        <domain>toto.tata</domain>
        <screenCode>16201000032884264000</screenCode>
        <itemAssociations>
            <itemCode>2118550000000</itemCode>
            <position>1</position>
        </itemAssociations>
    </screenXmlDto>
    <screenXmlDto>
        <articleCodeType>EAN</articleCodeType>
        <creationDate>2016-07-26T12:28:20.815+02:00</creationDate>
        <domain>toto.tata</domain>
        <screenCode>17201000030538091000</screenCode>
        <itemAssociations>
            <itemCode>4008033444958</itemCode>
            <position>1</position>
        </itemAssociations>
    </screenXmlDto>
</screens>

Answer 1

xmlstarlet解法：

xmlstarlet ed -d '//screenXmlDto[not(itemAssociations)]' file1.xml

-d - 删除操作
//screenXmlDto[not(itemAssociations)] - xpath 表达式 select 所有 screenXmlDto 节点没有 itemAssociations 节点作为子节点

输出：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<screens>
  <screenXmlDto>
    <articleCodeType>EAN</articleCodeType>
    <creationDate>2017-04-25T12:23:18.746+02:00</creationDate>
    <domain>toto.tata</domain>
    <screenCode>16201000032884264000</screenCode>
    <itemAssociations>
      <itemCode>2118550000000</itemCode>
      <position>1</position>
    </itemAssociations>
  </screenXmlDto>
  <screenXmlDto>
    <articleCodeType>EAN</articleCodeType>
    <creationDate>2016-07-26T12:28:20.815+02:00</creationDate>
    <domain>toto.tata</domain>
    <screenCode>17201000030538091000</screenCode>
    <itemAssociations>
      <itemCode>4008033444958</itemCode>
      <position>1</position>
    </itemAssociations>
  </screenXmlDto>
</screens>

(bash) 如果缺少值，则从 xml 中删除元素

(bash) Delete elements from xml if a value is missing

bash

sed

xmlstarlet