def METHOD_NAME(self, first_element, value):
    # Dimensions needs a little more processing.  We support
    # the key=value,key2=value syntax so we need to parse
    # that.
    dimensions = []
    for pair in split_on_commas(value):
        key, value = pair.split('=')
        dimensions.append({'Name': key, 'Value': value})
    first_element['Dimensions'] = dimensions