--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Gdata/Books/Extension/Viewability.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,123 @@
+<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Viewability.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * @see Zend_Gdata_Extension
+ */
+require_once 'Zend/Gdata/Extension.php';
+
+/**
+ * Describes a viewability
+ *
+ * @category   Zend
+ * @package    Zend_Gdata
+ * @subpackage Books
+ * @copyright  Copyright (c) 2005-2010 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;
+    }
+
+
+}
+