schema or catalog? what's the diference?

Hi all

pgagent.sql creates a new schema for pgagent stuff but it shows it as catalog

whats the diference? as it seems they are created almost equal..

for pgagent 'catalog'

CREATE SCHEMA pgagent
AUTHORIZATION postgres;
COMMENT ON CATALOG pgagent IS 'pgAgent system tables';

for public schema

REATE SCHEMA public
AUTHORIZATION postgres;
GRANT ALL ON SCHEMA public TO postgres;
GRANT ALL ON SCHEMA public TO public;
COMMENT ON SCHEMA public IS 'Standard public schema';

regards, Angel

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