Commercial Add-Ons and the GPL - big question mark !?

    public function getChunk($name, $properties = array()) {
    
        $chunk = null;
        
        if (!isset($this->chunks[$name])) {
            $chunk = $this->_getTplChunk($name);
            if (empty($chunk)) {
                $chunk = $this->modx->getObject('modChunk', array('name' => $name));
                if ($chunk == false) return false;
            }
            $this->chunks[$name] = $chunk->getContent();
        } else {
            $o = $this->chunks[$name];
            $chunk = $this->modx->newObject('modChunk');
            $chunk->setContent($o);
        }
        $chunk->setCacheable(false);
        
        return $chunk->process($properties);
    }

    private function _getTplChunk($name, $postfix = '.chunk.tpl') {
    
        $chunk = false;
        
        $f = $this->config['chunksPath'].strtolower($name).$postfix;
        if (file_exists($f)) {
            $o = file_get_contents($f);
            $chunk = $this->modx->newObject('modChunk');
            $chunk->set('name',$name);
            $chunk->setContent($o);
        }
        return $chunk;
    }