sql-dk --db "$postgresql_db" --sql "
SELECT
	table_schema,
	table_name,
	table_type
FROM information_schema.tables
WHERE table_schema IN ('pg_catalog', 'information_schema')
LIMIT 3;

SELECT
	typName,
	typCategory,
	typByVal
FROM pg_type
LIMIT 4" \
	--relation tables \
	--relation types \
	--formatter xml \
	| relpipe-in-xml