protected function _doHeaders_callback_atx($matches)
{
$level = strlen($matches[1]);
$attr = $this->doExtraAttributes("h{$level}", $dummy =& $matches[3]);
$block = "<h{$level}{$attr}>" . $this->runSpanGamut($matches[2]) . "</h{$level}>";
return "\n" . $this->hashBlock($block) . "\n\n";
}