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 <?php
 
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Gdata
  * @subpackage Books
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Gdata_Extension
  */
 // require_once 'Zend/Gdata/Extension.php';
 
 /**
  * Describes a viewability
  *
  * @category   Zend
  * @package    Zend_Gdata
  * @subpackage Books
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Gdata_Books_Extension_Viewability extends Zend_Gdata_Extension
 {
 
     protected $_rootNamespace = 'gbs';
     protected $_rootElement = 'viewability';
     protected $_value = null;
 
     /**
      * Constructor for Zend_Gdata_Books_Extension_Viewability which
      * Describes a viewability
      *
      * @param string|null $value A programmatic value representing the book's
      *        viewability mode.
      */
     public function __construct($value = null)
     {
         $this->registerAllNamespaces(Zend_Gdata_Books::$namespaces);
         parent::__construct();
         $this->_value = $value;
     }
 
     /**
      * Retrieves DOMElement which corresponds to this element and all
      * child properties. This is used to build this object back into a DOM
      * and eventually XML text for sending to the server upon updates, or
      * for application storage/persistance.
      *
      * @param DOMDocument $doc The DOMDocument used to construct DOMElements
      * @return DOMElement The DOMElement representing this element and all
      * child properties.
      */
     public function getDOM($doc = null, $majorVersion = 1, $minorVersion = null)
     {
         $element = parent::getDOM($doc);
         if ($this->_value !== null) {
             $element->setAttribute('value', $this->_value);
         }
         return $element;
     }
 
     /**
      * Extracts XML attributes from the DOM and converts them to the
      * appropriate object members.
      *
      * @param DOMNode $attribute The DOMNode attribute to be handled.
      */
     protected function takeAttributeFromDOM($attribute)
     {
         switch ($attribute->localName) {
         case 'value':
             $this->_value = $attribute->nodeValue;
             break;
         default:
             parent::takeAttributeFromDOM($attribute);
         }
     }
 
     /**
      * Returns the programmatic value that describes the viewability of a volume
      * in Google Book Search
      *
      * @return string The value
      */
     public function getValue()
     {
         return $this->_value;
     }
 
     /**
      * Sets the programmatic value that describes the viewability of a volume in
      * Google Book Search
      *
      * @param string $value programmatic value that describes the viewability
      *     of a volume in Googl eBook Search
      * @return Zend_Gdata_Books_Extension_Viewability Provides a fluent
      *     interface
      */
     public function setValue($value)
     {
         $this->_value = $value;
         return $this;
     }
 
 
 }