public function pullRemoteAssets(\DomDocument &$dom){
		$paths = [];
		foreach(['img' => 'src', 'script' => 'src', 'link' => 'href'] as $tag => $attr){
			foreach( $dom->getElementsByTagName($tag) as $elem ){
				$url = $elem->getAttribute($attr);
				if( !preg_match('/^(https?:)?\/\//', $url) ){
					continue;
				}
				// Get remote resource
				if( !($resource = $this->getRemote($url)) ){
					continue;
				}
				// Let's detect file mime
				list($basename) = explode('?', basename($url));
				$dir = Mime::getDestinationFolder($basename);
				if( 'Misc' === $dir ){
					// Oh, it might not have extension...
					if( $resource['info'] ){
						list($mime, $type) = explode('/', $resource['info']['content_type']);
						list($ext) = explode(';', $type);
						$new_dir = Mime::getDestinationFolder("hoge.{$ext}");
						if( $new_dir != $dir ){
							$dir = $new_dir;
							$basename = "{$basename}.{$ext}";
						}
					}
				}
				// O.K.
				$new_path = $dir.'/'.$basename;
				$elem->setAttribute($attr, '../'.$new_path);
				if( $this->distributor->write($resource['body'], 'OEBPS/'.$new_path) ){
					$paths[] = $new_path;
				}
			}
		}
		return $paths;
	}