html 필터의 이미지맵태그가 안먹습니다.

$def = $config->getHTMLDefinition(true); 

// Add usemap attribute to img tag 
    $def->addAttribute('img', 'usemap', 'CDATA'); 

// Add map tag 
    $map = $def->addElement( 
            'map', // name 
            'Block', // content set 
            'Flow', // allowed children 
            'Common', // attribute collection 
            array(// attributes 
        'name' => 'CDATA', 
        'id' => 'ID', 
        'title' => 'CDATA', 
            ) 
    ); 
    $map->excludes = array('map' => true); 

// Add area tag 
    $area = $def->addElement( 
            'area', // name 
            'Block', // content set 
            'Empty', // don't allow children 
            'Common', // attribute collection 
            array(// attributes 
        'name' => 'CDATA', 
        'id' => 'ID', 
        'alt' => 'Text', 
        'coords' => 'CDATA', 
        'accesskey' => 'Character', 
        'nohref' => new HTMLPurifier_AttrDef_Enum(array('nohref')), 
        'href' => 'URI', 
        'shape' => new HTMLPurifier_AttrDef_Enum(array('rect', 'circle', 'poly', 'default')), 
        'tabindex' => 'Number', 
        'target' => new HTMLPurifier_AttrDef_Enum(array('_blank', '_self', '_target', '_top')) 
            ) 
    ); 
    $area->excludes = array('area' => true);