public function html($rule = null)
{
$rule = $rule ? $this->_parser->checkRule($rule) : $this->_rule;
$this->log('Formatted output in "' . $rule . '" as "html"');
return $this->_formatter->html(array('value' => $this->val($rule), 'rule' => $rule), array('value' => $this->_value, 'rule' => $this->_rule), array('id' => $this->_uniqueId));
}