Fetch from refcursor and transactions

Hi,

I have question about fetching data from refcursor, why this operation
required to be inside transaction?

for example

with transaction

begin;
select * from foo();
fetch all from "<unnamed portal 1>";
commit;

when I try this without transaction I get error

select * from foo();
fetch all from "<unnamed portal 1>";

ERROR: cursor "<unnamed portal 1>" does not exist

why cursor "<unnamed portal 1>" are not defined in session and required
transaction?

best regards,
Wojciech

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