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NULL is OK, both for passing and for returning.
Generics and defining elements of containers and arrays.
Parameter for input. Default is transfer none.
NULL may be passed as the value in, out, in-out; or as a return value.
Parameter for returning results. Default is transfer full.
The callback is valid until first called.
The callback is valid only during the call to the method.
Exposed in C code, not necessarily available in other languages.
The caller owns the data container, but not the data inside it.
The caller owns the data, and is responsible for free it.
The data is owned by the callee, which is responsible of freeing it.