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 tag for the form field object.
	 * @param   mixed             $value    The form field value to validate.
	 * @param   string            $group    The field name group control value. This acts as as an array container for the field.
	 *                                      For example if the field has name="foo" and the group value is set to "bar" then the
	 *                                      full field name would end up being "bar[foo]".
	 * @param   JRegistry         $input    An optional JRegistry object with the entire data set to validate against the entire form.
	 * @param   JForm             $form     The form object for which the field is being tested.
	 *
	 * @return  boolean  True if the value is valid, false otherwise.
	 *
	 * @since   2.5
	 */
	public function test(SimpleXMLElement $element, $value, $group = null, JRegistry $input = null, JForm $form = null)
	{
		$plugin    = $element['plugin'] ?: JFactory::getApplication()->getParams()->get('captcha', JFactory::getConfig()->get('captcha', 0));
		$namespace = $element['namespace'] ?: $form->getName();
		// Use 0 for none
		if ($plugin === 0 || $plugin === '0')
		{
			return true;
		}
		else
		{
			$captcha = JCaptcha::getInstance($plugin, array('namespace' => (string) $namespace));
		}
		// Test the value.
		if (!$captcha->checkAnswer($value))
		{
			$error = $captcha->getError();
			if ($error instanceof Exception)
			{
				return $error;
			}
			else
			{
				return new JException($error);
			}
		}
		return true;
	}
}