搜索名称为 light 的节点（不区分大小写）

Created: November-22, 2018

XML

 placeholderCopy<Galaxy>
    <Light>sun</Light>
    <Device>satellite</Device>
    <Sensor>human</Sensor>
    <Name>Milky Way</Name>
</Galaxy>

XPATH

 placeholderCopy/Galaxy/*[lower-case(local-name())="light"]

要么

 placeholderCopy//*[lower-case(local-name())="light"]

OUTPUT

 placeholderCopy<Light>sun</Light>