xml - Groovy 删除 XMLSlurper 中的标签，replaceNode {} 什么都不做

Question

我正在使用 XMLSlurper (groovy 1.7.4) 解析一些 XML，我需要删除一个标签(而不是让它为空!)。这是说明它的代码示例:

import groovy.xml.StreamingMarkupBuilder

def CAR_RECORDS = '''
    <records>
      <car name='HSV Maloo' make='Holden' year='2006'>
        <country>Australia</country>
        <record type='speed'>Production Pickup Truck with speed of 271kph</record>
      </car>
      <car name='P50' make='Peel' year='1962'>
        <country>Isle of Man</country>
        <record type='size'>Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
      </car>
      <car name='Royale' make='Bugatti' year='1931'>
        <country>France</country>
        <record type='price'>Most Valuable Car at $15 million</record>
      </car>
    </records>
  '''

def records = new XmlSlurper().parseText(CAR_RECORDS)
def allRecords = records.car
assert 3 == allRecords.size()

def firstRecord = records.car[0]
assert 'car' == firstRecord.name()
println 'country before: ' + firstRecord.'country'.text()
firstRecord.'country'.replaceNode {}

println 'country after: ' + firstRecord.'country'.text()

这打印

country before: Australia
country after: Australia

在 XMLSlurper 中，没有 firstRecord.remove('country')

我真的很困惑。这是一件显而易见的事情...

Answer 1

如果您在调用 replaceNode 之后从 Slurper 打印出 XML:

import groovy.xml.XmlUtil

// ... your code here, followed by: ...

println XmlUtil.serialize(new StreamingMarkupBuilder().bind {
  mkp.yield records
} )

国家节点好像没了:

<?xml version="1.0" encoding="UTF-8"?>
<records>
  <car name="HSV Maloo" year="2006" make="Holden">
    <record type="speed">Production Pickup Truck with speed of 271kph</record>
  </car>
  <car name="P50" year="1962" make="Peel">
    <country>Isle of Man</country>
    <record type="size">Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
  </car>
  <car name="Royale" year="1931" make="Bugatti">
    <country>France</country>
    <record type="price">Most Valuable Car at $15 million</record>
  </car>
</records>