You can search for identifiers within the package.
in-package search v0.2.0
sfml.system_oo
Oo_sfml_system.Time
val add : time -> time -> time
val sub : time -> time -> time
val mul : time -> float -> time
val div : time -> float -> time
val (+) : time -> time -> time
val (-) : time -> time -> time
val (*) : time -> float -> time
val (/) : time -> float -> time