Apex: impact analysis script

Ever wondered where a particular package is being used by your Apex application(s)? This simpleSQL Plus script may be of use:

column obj_name format a50

undef search_text

accept search_text prompt "Enter search text: "

select application_id, page_id, 'Region' objtype, region_name obj_name
from   apex_application_page_regions
where lower(region_source) like '%&search_text.%'
UNION ALL
select application_id, page_id, 'Item' obj_type, item_name obj_name
from   apex_application_page_items
where  lower(item_source) like  '%&search_text.%'
UNION ALL
select application_id, page_id, 'Process' obj_type, process_name obj_name
from   apex_application_page_proc
where  lower(process_source) like  '%&search_text.%'
UNION ALL
select application_id, page_id, 'Branch' obj_type, TO_CHAR(process_sequence) obj_name
from   apex_application_page_branches
where  lower(branch_action) like  '%&search_text.%'
ORDER BY 1,2,3,4
/

For example:

Enter search text: my_package.my_fun

APPLICATION_ID    PAGE_ID OBJTYPE OBJ_NAME
-------------- ---------- ------- ------------------------------------------
           101        123 Process Call my function
           101        127 Branch  30
           102        128 Region  My Report
           102        129 Region  My Query
           103         21 Item    P21_MY_ITEM

Feel free to tell me if (a) I have missed anything, or (b) I have re-invented the wheel and should be using some built-in Apex utility!