SQL & PL/SQL

Hi,

I defined the followin types

TYPE tw_row IS RECORD (
doc_id NUMBER,
term VARCHAR2(100),
topic VARCHAR2(100),
weight NUMBER
);

TYPE tw_tab IS TABLE OF tw_row;

I am using as follows in function definition:

FUNCTION compute_term_weight(bagwords BagWordList) RETURN tw_tab PIPELINED IS

When I compile it, I am getting

PLS-00653: aggregate/table functions are not allowed in PL/SQL scope

I would appreciate if you have any thoughts.

Thanks.

Mustafa