code: 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;
  	}
docs: 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