public function addFeatureTypeAvMeta(ChildFeatureTypeAvMeta $l)
    {
        if ($this->collFeatureTypeAvMetas === null) {
            $this->initFeatureTypeAvMetas();
            $this->collFeatureTypeAvMetasPartial = true;
        }

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

        return $this;
    }