Example of updating xml with Groovy using XmlParser and NodeBuilder.

updating-xml-with-XmlParser-and-NodeBuilder.groovy

def exampleXmlString = '''<?xml version="1.0" encoding="UTF-8"?>
<persons>
	<person>
		<name>John</name>
		<lastname>Doe</lastname>
		<age>38</age>
	</person>
</persons>'''

def exampleXml = new XmlParser().parseText(exampleXmlString)

def personBuilder = new NodeBuilder()

def personNode = personBuilder.person {
	name('Jane')
	lastname('Doe')
	age('42')
}

assert exampleXml.append(personNode)

def writer = new StringWriter()
new XmlNodePrinter(new PrintWriter(writer)).print(exampleXml)
println writer.toString()