code: private function parseResult()
  	{
  		if($this->xml_result->Response->ResponseStatusCode != '1')
  		{
  			return array(
  				'Error' => array(
  					'ErrorSeverity' => "{$this->xml_result->Response->Error->ErrorSeverity}",
  					'ErrorCode' => "{$this->xml_result->Response->Error->ErrorCode}",
  					'ErrorDescription' => "{$this->xml_result->Response->Error->ErrorDescription}"
  				)
  			);
  			return $this->xml_result;
  		}
  
  		$simplified = array();
  		$shipping_choices = array();
  
  		foreach($this->xml_result->RatedShipment as $service)
  		{
  			$simplified[] = '{' . $service->TotalCharges->MonetaryValue . '}';
  		}
  
  		foreach($simplified as $key => $value)
  		{
  			$service = $this->xml_result->RatedShipment[$key]->children();
  
  			if($this->negotiated_rates && $service->NegotiatedRates->NetSummaryCharges->GrandTotal->MonetaryValue)
  			{
  				$rate = number_format((double)($service->NegotiatedRates->NetSummaryCharges->GrandTotal->MonetaryValue), 2);
  			}
  			else
  			{
  				$rate = number_format((double)($service->TransportationCharges->MonetaryValue), 2);
  			}
  
  			$shipping_choices["{$service->Service->Code}"] = array(
  				'service' => $this->shipperCodes("{$service->Service->Code}"),
  				'rate' => "{$rate}"
  			);
  		}
  
  		return $shipping_choices;
  	}
docs: Parse the returned XML object from
  the UPS webservice.
  
  @param void
  
  @return array