public function getAttributeType(ConnectionInterface $con = null)
    {
        if ($this->aAttributeType === null && ($this->attribute_type_id !== null)) {
            $this->aAttributeType = ChildAttributeTypeQuery::create()->findPk($this->attribute_type_id, $con);
            /* The following can be used additionally to
                guarantee the related object contains a reference
                to this object.  This level of coupling may, however, be
                undesirable since it could result in an only partially populated collection
                in the referenced object.
                $this->aAttributeType->addAttributeAttributeTypes($this);
             */
        }

        return $this->aAttributeType;
    }