code: public function propertysets()
      {
          if (!$this->propertysets instanceof PropertysetsController) {
              $this->propertysets = new PropertysetsController($this->getClient(), $this->cachePolicy, $this->cache);
              $this->propertysets->setLogger($this->logger);
          }
  
          return $this->propertysets;
      }
docs: PropertySets groups Properties together.
  
  @return PropertysetsController