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Parameter points to an array of items.
Parameter for input. Default is transfer none.
NULL must not be passed as the value in, out, in-out; or as a return value.
NULL may be passed as the value in, out, in-out; or as a return value.
NULL may be passed instead of a pointer to a location.
Parameter for returning results. Default is transfer full.
Out parameter, where callee must allocate storage.
Free data after the code is done.
Don't free data after the code is done.