2 users: 1 for tables,views.. 1 for functions,procedures...

Hi,
can anyone help me with this issue?
I have created 2 users: tom_tab and tom_prc.
- tom_tab's schema only contains tables, views, indexes, and sequences.

• tom_prc's schema only contains procedures, functions, packages Both users share the same tablespace. Now, how can I prevent user tom_tab from creating procedures, functions,... and user tom_prc from creating tables, views,... ? Thank you very much, Stefano