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diff --git a/framework/base/CModelBehavior.php b/framework/base/CModelBehavior.php
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+<?php
+/**
+ * CModelBehavior class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2011 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CModelBehavior is a base class for behaviors that are attached to a model component.
+ * The model should extend from {@link CModel} or its child classes.
+ *
+ * @property CModel $owner The owner model that this behavior is attached to.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CModelBehavior.php 3515 2011-12-28 12:29:24Z mdomba $
+ * @package system.base
+ */
+class CModelBehavior extends CBehavior
+{
+	/**
+	 * Declares events and the corresponding event handler methods.
+	 * The default implementation returns 'onAfterConstruct', 'onBeforeValidate' and 'onAfterValidate' events and handlers.
+	 * If you override this method, make sure you merge the parent result to the return value.
+	 * @return array events (array keys) and the corresponding event handler methods (array values).
+	 * @see CBehavior::events
+	 */
+	public function events()
+	{
+		return array(
+			'onAfterConstruct'=>'afterConstruct',
+			'onBeforeValidate'=>'beforeValidate',
+			'onAfterValidate'=>'afterValidate',
+		);
+	}
+
+	/**
+	 * Responds to {@link CModel::onAfterConstruct} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent $event event parameter
+	 */
+	public function afterConstruct($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CModel::onBeforeValidate} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link owner}.
+	 * You may set {@link CModelEvent::isValid} to be false to quit the validation process.
+	 * @param CModelEvent $event event parameter
+	 */
+	public function beforeValidate($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CModel::onAfterValidate} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link owner}.
+	 * @param CEvent $event event parameter
+	 */
+	public function afterValidate($event)
+	{
+	}
+}