public function createDraft($modifierId, $contentTypeId)
    {
        $createStruct = $this->mapper->createCreateStructFromType(
            $this->load($contentTypeId, Type::STATUS_DEFINED)
        );
        $createStruct->status = Type::STATUS_DRAFT;
        $createStruct->modifierId = $modifierId;
        $createStruct->modified = time();

        return $this->internalCreate($createStruct, $contentTypeId);
    }