Sets our main struct and passes it to the parent class
If info is statically allocated does nothing. Otherwise increases the reference count. Since 2.26
the main Gtk struct as a void*
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. Since 2.26
the main Gtk struct
Various data structures and convenience routines to parse and generate D-Bus introspection XML. Introspection information is used when registering objects with g_dbus_connection_register_object().
The format of D-Bus introspection XML is specified in the D-Bus specification.