/// Mapper to fetch file paths for excel lookups.
pubtraitMapper: Send + Sync {/// Fetch the path to the excel list file.
fnexl(&self)-> String;/// Fetch the path to a sheet header file.
fnexh(&self, sheet:&str)-> String;/// Fetch the path to a sheet page file.
fnexd(&self, sheet:&str, start_id:u32, language_id:u8)-> String;}