QBankApi.php
public function propertysets()
    {
        if (!$this->propertysets instanceof PropertysetsController) {
            $this->propertysets = new PropertysetsController($this->getClient(), $this->cachePolicy, $this->cache);
            $this->propertysets->setLogger($this->logger);
        }

        return $this->propertysets;
    }
public function propertysets()
    {
        if (!$this->propertysets instanceof PropertysetsController) {
            $this->propertysets = new PropertysetsController($this->getClient(), $this->cachePolicy, $this->cache);
            $this->propertysets->setLogger($this->logger);
        }

        return $this->propertysets;
    }
PropertySets groups Properties together.

@return PropertysetsController