Process ->
Arg R : HTTPRequest

When R.Action = 'add' then
Return ...

When R.Action = 'edit' then
Return ...

When R.Action = 'delete' then
Return ...

When R.Action = 'execute-add' then
Return ...

When R.Action = 'execute-edit' then
Return ...

When R.Action = 'execute-delete' then
Return ...

Else
Exit ERR_PARAMETER