1 syntax = "proto2"; 2 3 message Message1 4 { 5 optional uint32 fieldA = 1; 6 extensions 30 to max; 7 } 8 9 message Message2 10 { 11 extend Message1 12 { 13 optional Message2 extras = 30; 14 } 15 16 optional uint32 field1 = 1; 17 optional uint32 field2 = 2; 18 } 19
