+rule comm_token = parse
+ | "*)" { query_token lexbuf }
+ | [^ '*']* { comm_token lexbuf }
+and string_token = parse
+ | '"' { DQ }
+ | '\\' _ { STR (String.sub (Lexing.lexeme lexbuf) 1 1) }
+ | QSTR { STR (Lexing.lexeme lexbuf) }
+ | eof { EOF }
+and query_token = parse
+ | "(*" { comm_token lexbuf }
+ | SPC { query_token lexbuf }
+ | '"' { STR (qstr string_token lexbuf) }
+ | '(' { LP }
+ | ')' { RP }
+ | '{' { LC }
+ | '}' { RC }
+ | '@' { AT }
+ | '%' { PC }
+ | '$' { DL }
+ | '.' { FS }
+ | ',' { CM }
+ | '/' { SL }
+ | "and" { AND }
+ | "attr" { ATTR }
+ | "attribute" { ATTRIB }
+ | "be" { BE }
+ | "diff" { DIFF }
+ | "eq" { EQ }
+ | "ex" { EX }
+ | "false" { FALSE }
+ | "fun" { FUN }
+ | "in" { IN }
+ | "intersect" { INTER }
+ | "let" { LET }
+ | "meet" { MEET }
+ | "not" { NOT }
+ | "or" { OR }
+ | "pattern" { PAT }
+ | "ref" { REF }
+ | "refof" { REFOF }
+ | "relation" { REL }
+ | "select" { SELECT }
+ | "sub" { SUB }
+ | "super" { SUPER }
+ | "true" { TRUE }
+ | "union" { UNION }
+ | "where" { WHERE }
+ | IDEN { ID (Lexing.lexeme lexbuf) }
+ | eof { EOF }
+and result_token = parse
+ | SPC { result_token lexbuf }
+ | '"' { STR (qstr string_token lexbuf) }
+ | '{' { LC }
+ | '}' { RC }
+ | ',' { CM }
+ | ';' { SC }
+ | '=' { IS }
+ | "attr" { ATTR }
+ | eof { EOF }