Undocumented predicates
The following predicates are exported, but not or incorrectly documented.
-  database_fact(Arg1)
-  database_fact(Arg1, Arg2)
-  database_fact(Arg1, Arg2, Arg3)
-  database_fact_ort(Arg1, Arg2, Arg3, Arg4)
-  database_def_fact(Arg1, Arg2)
-  database_mod_fact(Arg1, Arg2)
-  database_use_fact(Arg1, Arg2)
-  clause_head(Arg1, Arg2)
-  fa_to_head(Arg1, Arg2, Arg3)