Working with XML on Groovy, this gist are a series of examples, also see the difference between XmlSlurper and XmlParser here: https://stackoverflow.com/a/7621603/14757065 for full samples visit: https://groovy-lang.org/processing-xml.html

1_reading_with_xml_slurper.groovy

import groovy.util.XmlSlurper

String xml = '''
<people>
   <person age='33'>
     <name>Omar</name>
   </person>
   <person age='30'>
     <name>Maria</name>
   </person>
</people>
'''

def people = new XmlSlurper().parseText(xml)

assert people.person[0].name == 'Omar'
assert people.person[1].name == 'Maria'
assert people.person*.@age == [33, 30]

2_reading_with_xml_parser.groovy

import groovy.util.XmlParser

String xml = '''
<people>
   <person age='33'>
     <name>Omar</name>
   </person>
   <person age='30'>
     <name>Maria</name>
   </person>
</people>
'''

def people = new XmlParser().parseText(xml)

assert people.person[0].name.text() == 'Omar'
assert people.person[1].name.text() == 'Mary'
assert people.person*.@age == ['33', '30']

3_writing_xml_with_markup_builder.groovy

import groovy.xml.MarkupBuilder

def writer = new StringWriter()
def xml = new MarkupBuilder(writer)

xml.people() {
  person(lastname:'Bautista', age:33) {
     name('Omar')
     from(city: 'Merida')
  }
  person( lastname:'Valenzuela', age:29) {
     name('Jorge')
     from(city: 'Guanajuato')
  }
}

println writer

4_writing_xml_with_streaming_markup_builder.groovy

import groovy.xml.StreamingMarkupBuilder

def xml = new StreamingMarkupBuilder().bind {
   people {
      person(lastname:'Bautista', age:33) {
         name('Omar')
         from(city: 'Merida')
      }
      person( lastname:'Valenzuela', age:29) {
         name('Jorge')
         from(city: 'Guanajuato')
      }
  }
}

println xml

5_read_feed_xml.groovy

import groovy.util.*

URL feedXML = 'https://refind.com/chrismessina.rss?amount=10'.toURL()

def feed = new XmlSlurper().parseText(feedXML.text)


feed.channel.item.each { entry -> 
   println """
   title:   ${entry.title}
   url:     ${entry.link}
   created: ${entry.pubDate}
   """
}

assert feed.channel.item.size() == 10