How Many Ways a Cursor Can Be Defined In Oracle

Wandering down the roads of Oracle resources, I found an open article related to Oracle Cursors. It is a blog by Steven Feuerstein who has written many books on pl sql and Oracle in general.
The article is about the ways a cursor can be defined in Oracle.

Oracle PL SQL | Pending Questions

1. The validity of a package depends upon the validity of the other database objects it references to; So if we try to create 2 packages which have dependency on each other, then how will that contention be resolved?