A question about "table function"

hi, all:

When I see the following definitions from postgresql document. I am
completely puzzeled.

CREATE TABLE foo (fooid int, foosubid int, fooname text);

>> As I say it, foo is already a set of columns.

CREATE FUNCTION getfoo(int) RETURNS setof foo AS '
SELECT * FROM foo WHERE fooid = $1;
' LANGUAGE SQL;

>> here return type should be "setof setof foo".

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Can I rewrite the definition as follows:

CREATE TYPE foo (fooid int, foosubid int, fooname text);

CREATE FUNCTION getfoo(int) RETURNS setof foo AS '
SELECT * FROM foo WHERE fooid = $1;
' LANGUAGE SQL;

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any comments are appriciate.

JACK DULL