The call to rss_gen_subscr.del was failing because it's a function and Oracle requires that we assign it's return value into a variable. So now we have a v_foo variable to accept the value. rss_gen_subscr.del should really be a procedure, not a function, but that's a much bigger fix and we may revamp RSS instead.
It may sound insane that I'm *finishing* porting of legacy, obsolete, blogger-specific categories to Oracle, but because of its brokeness my new stuff was broken too, so I had to fix it ... oh never mind