public function initializeArguments()
{
parent::initializeArguments();
$this->registerUniversalTagAttributes();
$this->registerTagAttribute('usemap', 'string', 'A hash-name reference to a map element with which to associate the image.', false, null);
$this->registerTagAttribute('ismap', 'string', 'Specifies that its img element provides access to a server-side image map.', false, null);
$this->registerTagAttribute('alt', 'string', 'Equivalent content for those who cannot process images or who have image loading disabled.', false, null);
$this->registerArgument('as', 'string', 'If specified, a template variable with this name containing the requested data will be inserted ' . 'instead of returning it.', false, null);
}