+exception IllFormedUri of string;;
+
+let _dottypes = ".types"
+let _types = "types",5
+let _ann = "ann",3
+let _dotann = ".ann"
+let _var = "var",3
+let _dotbody = ".body"
+let _con = "con",3
+let _xpointer = "#xpointer(1/"
+let _con3 = "con"
+let _var3 = "var"
+let _ind3 = "ind"
+let _ann3 = "ann"
+let _types5 = "types"
+let _xpointer8 = "xpointer"
+let _cic5 = "cic:/"
+
+let is_malformed suri =
+ try
+ if String.sub suri 0 5 <> _cic5 then true
+ else
+ let len = String.length suri - 5 in
+ let last5 = String.sub suri len 5 in
+ let last3 = String.sub last5 2 3 in
+ if last3 = _con3 || last3 = _var3 || last3 = _ind3 ||
+ last3 = _ann3 || last5 = _types5 || last5 = _dotbody then
+ false
+ else
+ try
+ let index = String.rindex suri '#' + 1 in
+ let xptr = String.sub suri index 8 in
+ if xptr = _xpointer8 then
+ false
+ else
+ true
+ with Not_found -> true
+ with Invalid_argument _ -> true
+