You can search for identifiers within the package.
in-package search v0.2.0
shapefile
Shapefile.Prj_lexer
val keyword : string -> Prj_parser.token
val __ocaml_lex_tables : Lexing.lex_tables
val token : Lexing.lexbuf -> Prj_parser.token
val __ocaml_lex_token_rec : Lexing.lexbuf -> int -> Prj_parser.token