public function addFeatureFeatureType(ChildFeatureFeatureType $l)
    {
        if ($this->collFeatureFeatureTypes === null) {
            $this->initFeatureFeatureTypes();
            $this->collFeatureFeatureTypesPartial = true;
        }

        if (!in_array($l, $this->collFeatureFeatureTypes->getArrayCopy(), true)) { // only add it if the **same** object is not already associated
            $this->doAddFeatureFeatureType($l);
        }

        return $this;
    }