Documentation errors in Programmers guide, chapter 4.

The following more interesting example takes a single argument of type EMP, and retrieves multiple results:

select function hobbies (EMP) returns set of HOBBIES
    as 'select (HOBBIES.all) from HOBBIES
        where $1.name = HOBBIES.person'
    language 'sql';

Should be:

create function hobbies (EMP) returns setof HOBBIES ...

It took me quite a while to figure out the second error, since "set of"
seemed perfectly natural there, when in fact it is "setof".

Thanks,

--Dan