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NULL is OK, both for passing and for returning.
Parameter points to an array of items.
NULL may be passed as the value in, out, in-out; or as a return value.
Parameter for returning results. Default is transfer full.
An interface that can be used within the GNOME stack itself, but that is not documented for end-users. Such functions should only be used in specified and documented ways.
Exposed in C code, not necessarily available in other languages.
Free data after the code is done.
Don't free data after the code is done.
Override the parsed C type with given type.