You can search for identifiers within the package.
in-package search v0.2.0
type token =
| NEXT
| OR
| IDENT of string
| PCDATA
| STAR
| QUESTION
| PLUS
| OPEN
| CLOSE
| END
val dtd_element : (Lexing.lexbuf -> token) -> Lexing.lexbuf -> Types.dtd_child