A pointer to a %NULL-terminated array of pointers to #GDBusAnnotationInfo structures or %NULL if there are no annotations.
Name of the argument, e.g. unix_user_id.
The reference count or -1 if statically allocated.
D-Bus signature of the argument (a single complete type).
If info is statically allocated does nothing. Otherwise increases
the reference count.
If info is statically allocated, does nothing. Otherwise decreases
the reference count of info. When its reference count drops to 0,
the memory used is freed.
Information about an argument for a method or a signal.