syntax = "proto2"; package examplecom; import "proto/othercom/external_child_message.proto"; message ParentMessageV2 { message InternalChildMessage { required string my_string = 1; } required InternalChildMessage internal_child_message = 1; optional InternalChildMessage opt_internal_child_message = 2; repeated InternalChildMessage internal_children = 3; required othercom.ExternalChildMessage external_child_message = 4; optional othercom.ExternalChildMessage opt_external_child_message = 5; repeated othercom.ExternalChildMessage external_children = 6; }