- message Point {
- required int32 x = 1;
- required int32 y = 2;
- optional string label = 3;
- }
- message Line {
- required Point start = 1;
- required Point end = 2;
- optional string label = 3;
- }
- message Polyline {
- repeated Point point = 1;
- optional string label = 2;
- }
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