what is the meaning of function proto_register_subtree_array?

["??????????" <237825552 () qq com>]

when you register a protocol,you should do the following three steps,1.proto_register_protocol();
2.proto_register_field_array();
3.proto_register_subtree_array()



what does the third function proto_register_subtree_array do?why ?and do it for what reason?

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