protected function getSchema(): NodeInterface
    {
        if ($this->schema === null) {
            $this->schema = $this->config->getConfigTreeBuilder()->buildTree();
        }

        return $this->schema;
    }
protected function getSchema(): NodeInterface
    {
        if ($this->schema === null) {
            $this->schema = $this->config->getConfigTreeBuilder()->buildTree();
        }

        return $this->schema;
    }
protected function getSchema ( ) : NodeInterface { if ( $ this -> schema === null ) { $ this -> schema = $ this -> config -> getConfigTreeBuilder ( ) -> buildTree ( ) ; } return $ this -> schema ; }
Get schema of mapping definition

@return NodeInterface
Get schema of mapping definition