public function schema($schema = null)
    {
        $this->schema = empty($schema) ? null : $schema;

        return $this->schema;
    }
public function schema($schema = null)
    {
        $this->schema = empty($schema) ? null : $schema;

        return $this->schema;
    }
public function schema ( $ schema = null ) { $ this -> schema = empty ( $ schema ) ? null : $ schema ; return $ this -> schema ; }
Sets allowed schema

@param string $schema

@return string
Sets allowed schema