Method getElement

/**
 * Get the filtered extension element from the manifest
 *
 * @param   string  $element  Optional element name to be converted
 *
 * @return  string  The filtered element
 *
 * @since   3.4
 */
public function getElement($element = null)
{
    if (!$element) {
        // Ensure the element is a string
        $element = (string) $this->getManifest()->packagename;
        // Filter the name for illegal characters
        $element = 'pkg_' . InputFilter::getInstance()->clean($element, 'cmd');
    }
    return $element;
}