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def comment = "<![CDATA[<!-- address is new to this release -->]]>"
def builder = new groovy.xml.StreamingMarkupBuilder()
builder.encoding = "UTF-8"
def person = {
  mkp.xmlDeclaration()
  mkp.pi("xml-stylesheet": "type='text/xsl' href='myfile.xslt'" )
  mkp.declareNamespace('':'http://myDefaultNamespace')
  mkp.declareNamespace('location':'http://someOtherNamespace')
  person(id:100){
    firstname("Jane")
    lastname("Doe")
    mkp.yieldUnescaped(comment)
    location.address("123 Main")
  }
}
def writer = new FileWriter("person.xml")
writer << builder.bind(person)

//output:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type='text/xsl' href='myfile.xslt'?>
<person id='100'
        xmlns='http://myDefaultNamespace'
        xmlns:location='http://someOtherNamespace'>
  <firstname>Jane</firstname>
  <lastname>Doe</lastname>
  <![CDATA[<!-- address is new to this release -->]]>
  <location:address>123 Main</location:address>
</person>