protected function toString_content($attributes = true, $recursive = true, $content_only = false) {
		$s = '';
		foreach($this->children as $c) {
			$s .= $c->toString($attributes, $recursive, $content_only);
		}
		return $s;
	}
protected function toString_content($attributes = true, $recursive = true, $content_only = false) {
		$s = '';
		foreach($this->children as $c) {
			$s .= $c->toString($attributes, $recursive, $content_only);
		}
		return $s;
	}
Returns the content of the node (child tags and text)
@param bool $attributes Print attributes of child tags
@param bool|int $recursive How many sublevels of childtags to print. True for all.
@param bool $content_only Only print text, false will print tags too.
@return string
@access private