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Monad type class seems to be working
author Adam Chlipala <adamc@hcoop.net>
date Fri, 19 Dec 2008 10:27:58 -0500
parents 5d494183ca89
children 74800be65591
rev   line source
adamc@56 1 type int
adamc@56 2 type float
adamc@56 3 type string
adamc@436 4 type time
adamc@91 5
adamc@119 6 type unit = {}
adamc@119 7
adamc@186 8 datatype bool = False | True
adamc@186 9
adamc@288 10 datatype option t = None | Some of t
adamc@284 11
adamc@91 12
adamc@256 13 (** Basic type classes *)
adamc@256 14
adamc@256 15 class eq
adamc@256 16 val eq : t ::: Type -> eq t -> t -> t -> bool
adamc@257 17 val ne : t ::: Type -> eq t -> t -> t -> bool
adamc@256 18 val eq_int : eq int
adamc@394 19 val eq_float : eq float
adamc@256 20 val eq_string : eq string
adamc@256 21 val eq_bool : eq bool
adamc@437 22 val eq_time : eq time
adamc@422 23 val mkEq : t ::: Type -> (t -> t -> bool) -> eq t
adamc@256 24
adamc@389 25 class num
adamc@417 26 val zero : t ::: Type -> num t -> t
adamc@389 27 val neg : t ::: Type -> num t -> t -> t
adamc@389 28 val plus : t ::: Type -> num t -> t -> t -> t
adamc@389 29 val minus : t ::: Type -> num t -> t -> t -> t
adamc@389 30 val times : t ::: Type -> num t -> t -> t -> t
adamc@389 31 val div : t ::: Type -> num t -> t -> t -> t
adamc@389 32 val mod : t ::: Type -> num t -> t -> t -> t
adamc@389 33 val num_int : num int
adamc@390 34 val num_float : num float
adamc@389 35
adamc@391 36 class ord
adamc@391 37 val lt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 38 val le : t ::: Type -> ord t -> t -> t -> bool
adamc@391 39 val gt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 40 val ge : t ::: Type -> ord t -> t -> t -> bool
adamc@391 41 val ord_int : ord int
adamc@394 42 val ord_float : ord float
adamc@394 43 val ord_string : ord string
adamc@394 44 val ord_bool : ord bool
adamc@437 45 val ord_time : ord time
adamc@391 46
adamc@256 47
adamc@283 48 (** String operations *)
adamc@283 49
adamc@283 50 val strcat : string -> string -> string
adamc@283 51
adamc@286 52 class show
adamc@286 53 val show : t ::: Type -> show t -> t -> string
adamc@286 54 val show_int : show int
adamc@286 55 val show_float : show float
adamc@286 56 val show_string : show string
adamc@286 57 val show_bool : show bool
adamc@436 58 val show_time : show time
adamc@452 59 val mkShow : t ::: Type -> (t -> string) -> show t
adamc@286 60
adamc@290 61 class read
adamc@290 62 val read : t ::: Type -> read t -> string -> option t
adamc@292 63 val readError : t ::: Type -> read t -> string -> t
adamc@292 64 (* [readError] calls [error] if the input is malformed. *)
adamc@290 65 val read_int : read int
adamc@290 66 val read_float : read float
adamc@290 67 val read_string : read string
adamc@290 68 val read_bool : read bool
adamc@436 69 val read_time : read time
adamc@288 70
adamc@283 71
adamc@564 72 (** * Monads *)
adamc@564 73
adamc@564 74 class monad :: Type -> Type
adamc@564 75 val return : m ::: (Type -> Type) -> t ::: Type
adamc@564 76 -> monad m
adamc@564 77 -> t -> m t
adamc@564 78 val bind : m ::: (Type -> Type) -> t1 ::: Type -> t2 ::: Type
adamc@564 79 -> monad m
adamc@564 80 -> m t1 -> (t1 -> m t2)
adamc@564 81 -> m t2
adamc@564 82
adamc@564 83 (** ** Transactions *)
adamc@456 84
adamc@456 85 con transaction :: Type -> Type
adamc@564 86 val transaction_monad : monad transaction
adamc@456 87
adamc@456 88
adamc@456 89
adamc@456 90 (** HTTP operations *)
adamc@456 91
adamc@456 92 val requestHeader : string -> transaction (option string)
adamc@456 93
adamc@459 94 con http_cookie :: Type -> Type
adamc@459 95 val getCookie : t ::: Type -> http_cookie t -> transaction (option t)
adamc@459 96 val setCookie : t ::: Type -> http_cookie t -> t -> transaction unit
adamc@459 97
adamc@456 98
adamc@203 99 (** SQL *)
adamc@203 100
adamc@203 101 con sql_table :: {Type} -> Type
adamc@203 102
adamc@204 103 (*** Queries *)
adamc@204 104
adamc@233 105 con sql_query :: {{Type}} -> {Type} -> Type
adamc@233 106 con sql_query1 :: {{Type}} -> {{Type}} -> {Type} -> Type
adamc@234 107 con sql_exp :: {{Type}} -> {{Type}} -> {Type} -> Type -> Type
adamc@204 108
adamc@223 109 con sql_subset :: {{Type}} -> {{Type}} -> Type
adamc@223 110 val sql_subset : keep_drop :: {({Type} * {Type})}
adamc@354 111 -> sql_subset
adamc@354 112 (fold (fn nm (fields :: ({Type} * {Type}))
adamc@354 113 acc [[nm] ~ acc]
adamc@354 114 [fields.1 ~ fields.2] =>
adamc@354 115 [nm = fields.1 ++ fields.2]
adamc@354 116 ++ acc) [] keep_drop)
adamc@354 117 (fold (fn nm (fields :: ({Type} * {Type}))
adamc@354 118 acc [[nm] ~ acc] =>
adamc@354 119 [nm = fields.1] ++ acc)
adamc@354 120 [] keep_drop)
adamc@354 121 val sql_subset_all : tables :: {{Type}} -> sql_subset tables tables
adamc@223 122
adamc@229 123 val sql_query1 : tables ::: {{Type}}
adamc@354 124 -> grouped ::: {{Type}}
adamc@354 125 -> selectedFields ::: {{Type}}
adamc@354 126 -> selectedExps ::: {Type}
adamc@354 127 -> {From : $(fold (fn nm (fields :: {Type}) acc [[nm] ~ acc] =>
adamc@354 128 [nm = sql_table fields] ++ acc)
adamc@354 129 [] tables),
adamc@354 130 Where : sql_exp tables [] [] bool,
adamc@354 131 GroupBy : sql_subset tables grouped,
adamc@354 132 Having : sql_exp grouped tables [] bool,
adamc@354 133 SelectFields : sql_subset grouped selectedFields,
adamc@354 134 SelectExps : $(fold (fn nm (t :: Type) acc [[nm] ~ acc] =>
adamc@354 135 [nm = sql_exp grouped tables [] t]
adamc@354 136 ++ acc) [] selectedExps) }
adamc@354 137 -> sql_query1 tables selectedFields selectedExps
adamc@229 138
adamc@229 139 type sql_relop
adamc@229 140 val sql_union : sql_relop
adamc@229 141 val sql_intersect : sql_relop
adamc@229 142 val sql_except : sql_relop
adamc@260 143 val sql_relop : tables1 ::: {{Type}}
adamc@354 144 -> tables2 ::: {{Type}}
adamc@354 145 -> selectedFields ::: {{Type}}
adamc@354 146 -> selectedExps ::: {Type}
adamc@354 147 -> sql_relop
adamc@354 148 -> sql_query1 tables1 selectedFields selectedExps
adamc@354 149 -> sql_query1 tables2 selectedFields selectedExps
adamc@354 150 -> sql_query1 selectedFields selectedFields selectedExps
adamc@229 151
adamc@230 152 type sql_direction
adamc@230 153 val sql_asc : sql_direction
adamc@230 154 val sql_desc : sql_direction
adamc@230 155
adamc@234 156 con sql_order_by :: {{Type}} -> {Type} -> Type
adamc@234 157 val sql_order_by_Nil : tables ::: {{Type}} -> exps :: {Type} -> sql_order_by tables exps
adamc@234 158 val sql_order_by_Cons : tables ::: {{Type}} -> exps ::: {Type} -> t ::: Type
adamc@354 159 -> sql_exp tables [] exps t -> sql_direction
adamc@354 160 -> sql_order_by tables exps
adamc@354 161 -> sql_order_by tables exps
adamc@230 162
adamc@231 163 type sql_limit
adamc@231 164 val sql_no_limit : sql_limit
adamc@231 165 val sql_limit : int -> sql_limit
adamc@354 166
adamc@232 167 type sql_offset
adamc@232 168 val sql_no_offset : sql_offset
adamc@232 169 val sql_offset : int -> sql_offset
adamc@232 170
adamc@229 171 val sql_query : tables ::: {{Type}}
adamc@354 172 -> selectedFields ::: {{Type}}
adamc@354 173 -> selectedExps ::: {Type}
adamc@354 174 -> {Rows : sql_query1 tables selectedFields selectedExps,
adamc@354 175 OrderBy : sql_order_by tables selectedExps,
adamc@354 176 Limit : sql_limit,
adamc@354 177 Offset : sql_offset}
adamc@354 178 -> sql_query selectedFields selectedExps
adamc@204 179
adamc@354 180 val sql_field : otherTabs ::: {{Type}} -> otherFields ::: {Type}
adamc@354 181 -> fieldType ::: Type -> agg ::: {{Type}}
adamc@354 182 -> exps ::: {Type}
adamc@354 183 -> tab :: Name -> field :: Name
adamc@354 184 -> sql_exp
adamc@354 185 ([tab = [field = fieldType] ++ otherFields] ++ otherTabs)
adamc@354 186 agg exps fieldType
adamc@234 187
adamc@354 188 val sql_exp : tabs ::: {{Type}} -> agg ::: {{Type}} -> t ::: Type -> rest ::: {Type}
adamc@354 189 -> nm :: Name
adamc@354 190 -> sql_exp tabs agg ([nm = t] ++ rest) t
adamc@209 191
adamc@221 192 class sql_injectable
adamc@221 193 val sql_bool : sql_injectable bool
adamc@221 194 val sql_int : sql_injectable int
adamc@221 195 val sql_float : sql_injectable float
adamc@221 196 val sql_string : sql_injectable string
adamc@437 197 val sql_time : sql_injectable time
adamc@467 198 val sql_option_bool : sql_injectable (option bool)
adamc@467 199 val sql_option_int : sql_injectable (option int)
adamc@467 200 val sql_option_float : sql_injectable (option float)
adamc@467 201 val sql_option_string : sql_injectable (option string)
adamc@467 202 val sql_option_time : sql_injectable (option time)
adamc@354 203 val sql_inject : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 204 -> t ::: Type
adamc@354 205 -> sql_injectable t -> t -> sql_exp tables agg exps t
adamc@209 206
adamc@470 207 val sql_is_null : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@470 208 -> t ::: Type
adamc@470 209 -> sql_exp tables agg exps (option t)
adamc@470 210 -> sql_exp tables agg exps bool
adamc@470 211
adamc@559 212 class sql_arith
adamc@559 213 val sql_int_arith : sql_arith int
adamc@559 214 val sql_float_arith : sql_arith float
adamc@559 215
adamc@220 216 con sql_unary :: Type -> Type -> Type
adamc@220 217 val sql_not : sql_unary bool bool
adamc@354 218 val sql_unary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 219 -> arg ::: Type -> res ::: Type
adamc@354 220 -> sql_unary arg res -> sql_exp tables agg exps arg
adamc@354 221 -> sql_exp tables agg exps res
adamc@220 222
adamc@559 223 val sql_neg : t ::: Type -> sql_arith t -> sql_unary t t
adamc@559 224
adamc@220 225 con sql_binary :: Type -> Type -> Type -> Type
adamc@220 226 val sql_and : sql_binary bool bool bool
adamc@220 227 val sql_or : sql_binary bool bool bool
adamc@234 228 val sql_binary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 229 -> arg1 ::: Type -> arg2 ::: Type -> res ::: Type
adamc@354 230 -> sql_binary arg1 arg2 res -> sql_exp tables agg exps arg1
adamc@354 231 -> sql_exp tables agg exps arg2
adamc@354 232 -> sql_exp tables agg exps res
adamc@220 233
adamc@559 234 val sql_plus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 235 val sql_minus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 236 val sql_times : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 237 val sql_div : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 238 val sql_mod : sql_binary int int int
adamc@559 239
adamc@559 240 val sql_eq : t ::: Type -> sql_binary t t bool
adamc@559 241 val sql_ne : t ::: Type -> sql_binary t t bool
adamc@559 242 val sql_lt : t ::: Type -> sql_binary t t bool
adamc@559 243 val sql_le : t ::: Type -> sql_binary t t bool
adamc@559 244 val sql_gt : t ::: Type -> sql_binary t t bool
adamc@559 245 val sql_ge : t ::: Type -> sql_binary t t bool
adamc@203 246
adamc@235 247 val sql_count : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@544 248 -> sql_exp tables agg exps int
adamc@235 249
adamc@236 250 con sql_aggregate :: Type -> Type
adamc@354 251 val sql_aggregate : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 252 -> t ::: Type
adamc@354 253 -> sql_aggregate t -> sql_exp agg agg exps t
adamc@354 254 -> sql_exp tables agg exps t
adamc@236 255
adamc@236 256 class sql_summable
adamc@236 257 val sql_summable_int : sql_summable int
adamc@236 258 val sql_summable_float : sql_summable float
adamc@236 259 val sql_avg : t ::: Type -> sql_summable t -> sql_aggregate t
adamc@236 260 val sql_sum : t ::: Type -> sql_summable t -> sql_aggregate t
adamc@236 261
adamc@236 262 class sql_maxable
adamc@236 263 val sql_maxable_int : sql_maxable int
adamc@236 264 val sql_maxable_float : sql_maxable float
adamc@236 265 val sql_maxable_string : sql_maxable string
adamc@437 266 val sql_maxable_time : sql_maxable time
adamc@236 267 val sql_max : t ::: Type -> sql_maxable t -> sql_aggregate t
adamc@236 268 val sql_min : t ::: Type -> sql_maxable t -> sql_aggregate t
adamc@236 269
adamc@441 270 con sql_nfunc :: Type -> Type
adamc@441 271 val sql_nfunc : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@441 272 -> t ::: Type
adamc@441 273 -> sql_nfunc t -> sql_exp tables agg exps t
adamc@441 274 val sql_current_timestamp : sql_nfunc time
adamc@441 275
adamc@235 276
adamc@243 277 (*** Executing queries *)
adamc@243 278
adamc@354 279 val query : tables ::: {{Type}} -> exps ::: {Type}
adamc@354 280 -> fn [tables ~ exps] =>
adamc@354 281 state ::: Type
adamc@354 282 -> sql_query tables exps
adamc@356 283 -> ($(exps ++ fold (fn nm (fields :: {Type}) acc [[nm] ~ acc] =>
adamc@354 284 [nm = $fields] ++ acc) [] tables)
adamc@354 285 -> state
adamc@354 286 -> transaction state)
adamc@354 287 -> state
adamc@354 288 -> transaction state
adamc@243 289
adamc@243 290
adamc@299 291 (*** Database mutators *)
adamc@299 292
adamc@299 293 type dml
adamc@299 294 val dml : dml -> transaction unit
adamc@299 295
adamc@299 296 val insert : fields ::: {Type}
adamc@354 297 -> sql_table fields
adamc@354 298 -> $(fold (fn nm (t :: Type) acc [[nm] ~ acc] =>
adamc@354 299 [nm = sql_exp [] [] [] t] ++ acc)
adamc@354 300 [] fields)
adamc@354 301 -> dml
adamc@299 302
adamc@403 303 val update : unchanged ::: {Type} -> changed :: {Type} ->
adamc@354 304 fn [changed ~ unchanged] =>
adamc@354 305 $(fold (fn nm (t :: Type) acc [[nm] ~ acc] =>
adamc@354 306 [nm = sql_exp [T = changed ++ unchanged] [] [] t]
adamc@354 307 ++ acc)
adamc@354 308 [] changed)
adamc@354 309 -> sql_table (changed ++ unchanged)
adamc@354 310 -> sql_exp [T = changed ++ unchanged] [] [] bool
adamc@354 311 -> dml
adamc@299 312
adamc@299 313 val delete : fields ::: {Type}
adamc@354 314 -> sql_table fields
adamc@354 315 -> sql_exp [T = fields] [] [] bool
adamc@354 316 -> dml
adamc@299 317
adamc@338 318 (*** Sequences *)
adamc@338 319
adamc@338 320 type sql_sequence
adamc@338 321 val nextval : sql_sequence -> transaction int
adamc@338 322
adamc@299 323
adamc@203 324 (** XML *)
adamc@203 325
adamc@139 326 con tag :: {Type} -> {Unit} -> {Unit} -> {Type} -> {Type} -> Type
adamc@91 327
adamc@91 328
adamc@139 329 con xml :: {Unit} -> {Type} -> {Type} -> Type
adamc@141 330 val cdata : ctx ::: {Unit} -> use ::: {Type} -> string -> xml ctx use []
adamc@354 331 val tag : attrsGiven ::: {Type} -> attrsAbsent ::: {Type}
adamc@354 332 -> ctxOuter ::: {Unit} -> ctxInner ::: {Unit}
adamc@354 333 -> useOuter ::: {Type} -> useInner ::: {Type}
adamc@354 334 -> bindOuter ::: {Type} -> bindInner ::: {Type}
adamc@354 335 -> fn [attrsGiven ~ attrsAbsent]
adamc@354 336 [useOuter ~ useInner]
adamc@354 337 [bindOuter ~ bindInner] =>
adamc@354 338 $attrsGiven
adamc@354 339 -> tag (attrsGiven ++ attrsAbsent)
adamc@354 340 ctxOuter ctxInner useOuter bindOuter
adamc@354 341 -> xml ctxInner useInner bindInner
adamc@354 342 -> xml ctxOuter (useOuter ++ useInner) (bindOuter ++ bindInner)
adamc@140 343 val join : ctx ::: {Unit}
adamc@139 344 -> use1 ::: {Type} -> bind1 ::: {Type} -> bind2 ::: {Type}
adamc@354 345 -> fn [use1 ~ bind1] [bind1 ~ bind2] =>
adamc@354 346 xml ctx use1 bind1
adamc@354 347 -> xml ctx (use1 ++ bind1) bind2
adamc@354 348 -> xml ctx use1 (bind1 ++ bind2)
adamc@354 349 val useMore : ctx ::: {Unit} -> use1 ::: {Type} -> use2 ::: {Type}
adamc@354 350 -> bind ::: {Type}
adamc@354 351 -> fn [use1 ~ use2] =>
adamc@354 352 xml ctx use1 bind
adamc@354 353 -> xml ctx (use1 ++ use2) bind
adamc@91 354
adamc@110 355 con xhtml = xml [Html]
adamc@139 356 con page = xhtml [] []
adamc@325 357 con xbody = xml [Body] [] []
adamc@326 358 con xtr = xml [Body, Tr] [] []
adamc@361 359 con xform = xml [Body, Form] [] []
adamc@110 360
adamc@204 361 (*** HTML details *)
adamc@204 362
adamc@140 363 con html = [Html]
adamc@140 364 con head = [Head]
adamc@140 365 con body = [Body]
adamc@361 366 con form = [Body, Form]
adamc@332 367 con tabl = [Body, Table]
adamc@332 368 con tr = [Body, Tr]
adamc@93 369
adamc@140 370 val head : unit -> tag [] html head [] []
adamc@140 371 val title : unit -> tag [] head [] [] []
adamc@110 372
adamc@140 373 val body : unit -> tag [] html body [] []
adamc@354 374 con bodyTag = fn (attrs :: {Type}) =>
adamc@354 375 ctx ::: {Unit} ->
adamc@354 376 fn [[Body] ~ ctx] =>
adamc@354 377 unit -> tag attrs ([Body] ++ ctx) ([Body] ++ ctx) [] []
adamc@354 378 con bodyTagStandalone = fn (attrs :: {Type}) =>
adamc@354 379 ctx ::: {Unit}
adamc@354 380 -> fn [[Body] ~ ctx] =>
adamc@354 381 unit -> tag attrs ([Body] ++ ctx) [] [] []
adamc@141 382
adamc@141 383 val br : bodyTagStandalone []
adamc@119 384
adamc@140 385 val p : bodyTag []
adamc@140 386 val b : bodyTag []
adamc@140 387 val i : bodyTag []
adamc@407 388 val tt : bodyTag []
adamc@140 389 val font : bodyTag [Size = int, Face = string]
adamc@140 390
adamc@140 391 val h1 : bodyTag []
adamc@443 392 val h2 : bodyTag []
adamc@443 393 val h3 : bodyTag []
adamc@443 394 val h4 : bodyTag []
adamc@469 395
adamc@140 396 val li : bodyTag []
adamc@469 397 val ol : bodyTag []
adamc@469 398 val ul : bodyTag []
adamc@140 399
adamc@410 400 val hr : bodyTag []
adamc@410 401
adamc@280 402 val a : bodyTag [Link = transaction page]
adamc@140 403
adamc@361 404 val form : ctx ::: {Unit} -> bind ::: {Type}
adamc@354 405 -> fn [[Body] ~ ctx] =>
adamc@354 406 xml form [] bind
adamc@354 407 -> xml ([Body] ++ ctx) [] []
adamc@361 408 con formTag = fn (ty :: Type) (inner :: {Unit}) (attrs :: {Type}) =>
adamc@354 409 ctx ::: {Unit}
adamc@361 410 -> fn [[Form] ~ ctx] =>
adamc@354 411 nm :: Name -> unit
adamc@361 412 -> tag attrs ([Form] ++ ctx) inner [] [nm = ty]
adamc@444 413 val textbox : formTag string [] [Value = string, Size = int]
adamc@444 414 val password : formTag string [] [Value = string, Size = int]
adamc@444 415 val textarea : formTag string [] [Rows = int, Cols = int]
adamc@153 416
adamc@361 417 val checkbox : formTag bool [] [Checked = bool]
adamc@190 418
adamc@153 419 con radio = [Body, Radio]
adamc@361 420 val radio : formTag string radio []
adamc@153 421 val radioOption : unit -> tag [Value = string] radio [] [] []
adamc@142 422
adamc@154 423 con select = [Select]
adamc@361 424 val select : formTag string select []
adamc@422 425 val option : unit -> tag [Value = string, Selected = bool] select [] [] []
adamc@154 426
adamc@354 427 val submit : ctx ::: {Unit} -> use ::: {Type}
adamc@361 428 -> fn [[Form] ~ ctx] =>
adamc@354 429 unit
adamc@406 430 -> tag [Value = string, Action = $use -> transaction page]
adamc@361 431 ([Form] ++ ctx) ([Form] ++ ctx) use []
adamc@283 432
adamc@325 433 (*** Tables *)
adamc@325 434
adamc@406 435 val tabl : other ::: {Unit} -> fn [other ~ [Body, Table]] =>
adamc@406 436 unit -> tag [Border = int] ([Body] ++ other) ([Body, Table] ++ other) [] []
adamc@406 437 val tr : other ::: {Unit} -> fn [other ~ [Body, Table, Tr]] =>
adamc@406 438 unit -> tag [] ([Body, Table] ++ other) ([Body, Tr] ++ other) [] []
adamc@406 439 val th : other ::: {Unit} -> fn [other ~ [Body, Tr]] =>
adamc@406 440 unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@406 441 val td : other ::: {Unit} -> fn [other ~ [Body, Tr]] =>
adamc@406 442 unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@325 443
adamc@283 444
adamc@283 445 (** Aborting *)
adamc@283 446
adamc@283 447 val error : t ::: Type -> xml [Body] [] [] -> t