/**
  * Describe Volumes 
  * Describes the status of the indicated or, in lieu of any specified,  all volumes belonging to the caller. Volumes that have been deleted are not described.
  * 
  * @see http://docs.amazonwebservices.com/AWSEC2/2008-12-01/DeveloperGuide/ApiReference-Query-DescribeVolumes.html
  * @param mixed $request array of parameters for Amazon_EC2_Model_DescribeVolumesRequest request
  * or Amazon_EC2_Model_DescribeVolumesRequest object itself
  * @see Amazon_EC2_Model_DescribeVolumes
  * @return Amazon_EC2_Model_DescribeVolumesResponse Amazon_EC2_Model_DescribeVolumesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function describeVolumes($request)
 {
     if (!$request instanceof Amazon_EC2_Model_DescribeVolumesRequest) {
         require_once 'Amazon/EC2/Model/DescribeVolumesRequest.php';
         $request = new Amazon_EC2_Model_DescribeVolumesRequest($request);
     }
     require_once 'Amazon/EC2/Model/DescribeVolumesResponse.php';
     return Amazon_EC2_Model_DescribeVolumesResponse::fromXML($this->_invoke($this->_convertDescribeVolumes($request)));
 }
 /**
  * Describe Volumes 
  * Describes the status of the indicated or, in lieu of any specified,  all volumes belonging to the caller. Volumes that have been deleted are not described.
  *   
  * @see http://docs.amazonwebservices.com/AWSEC2/2008-12-01/DeveloperGuide/ApiReference-Query-DescribeVolumes.html      
  * @param mixed $request array of parameters for Amazon_EC2_Model_DescribeVolumes request or Amazon_EC2_Model_DescribeVolumes object itself
  * @see Amazon_EC2_Model_DescribeVolumes
  * @return Amazon_EC2_Model_DescribeVolumesResponse Amazon_EC2_Model_DescribeVolumesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function describeVolumes($request)
 {
     require_once 'Amazon/EC2/Model/DescribeVolumesResponse.php';
     return Amazon_EC2_Model_DescribeVolumesResponse::fromXML($this->_invoke('DescribeVolumes'));
 }