public function getMapContents($includeLastExtension = true)
    {
        if ($this->_mappingsChanged) {
          $this->_generateMappings();
        }
        if ($includeLastExtension && !isset($this->_map->{'_x_org_koala-framework_last'})) {
            $this->_addLastExtension();
        }
        return json_encode($this->_map);
    }