view without definition in information_schema.Views

Hello!

I realised that there are views in information_schema.Views without
definition but \d+ psql command shows the definition. Where does the 
definition live, please?

SELECT	*
FROM	information_schema.Views
WHERE	Table_Schema NOT IN ('pg_catalog', 'information_schema')
	AND View_Definition IS NULL
LIMIT	10;

Regards
Hans Ginzel