+ n_doc: nullable PDoc ,
+ n_readable: nullable PAble ,
+ n_writable: nullable PAble ,
+ n_kwredef: nullable TKwredef ,
+ n_visibility: nullable PVisibility ,
+ n_kwattr: nullable TKwattr ,
+ n_kwvar: nullable TKwvar ,
+ n_id: nullable TAttrid ,
+ n_type: nullable PType ,
+ n_expr: nullable PExpr