    public static function buildFromDirectory($dir = null) {
        $builder     = new HTMLPurifier_ConfigSchema_InterchangeBuilder();
        $interchange = new HTMLPurifier_ConfigSchema_Interchange();
        return $builder->buildDir($interchange, $dir);
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.