how insert/move/delete nodes xml groovy?

for example, i have following xml document:

def car_records = '''
    <records>
      <car name='hsv maloo' make='holden' year='2006'/>
      <car name='p50' make='peel' year='1962'/>
      <car name='royale' make='bugatti' year='1931'/>
    </records>
'''

and i wish pierce car "royale" adult initial one, insert new car only after car"hsv maloo", outcome be:

'''
    <records>
      <car name='royale' make='bugatti' year='1931'/>
      <car name='hsv maloo' make='holden' year='2006'/>
      <car name='my new car' make='peel' year='1962'/>
      <car name='p50' make='peel' year='1962'/>
    </records>
'''

how groovy? comments welcome.