public function addMeta($tag, $value, array $attributes = []){
		$value = $this->h($value);
		if( false !== strpos($tag, ':') ){
			$tags = explode(':', $tag);
			$node = $this->dom->metadata->addChild($tags[1], $value, Schemas::getUri($tags[0]));
		}else{
			$node = $this->dom->metadata->addChild($tag, $value);
		}
		foreach( $attributes as $key => $val ){
			$node[$key] = $this->h($val);
		}
	}