Confusion over duplicate MTA Extension Files

[Luca Bommarito]

Hi all,

I noticed that the mta service alerts spec here (https://raw.githubusercontent.com/OneBusAway/onebusaway-gtfs-realtime-api/master/src/main/proto/com/google/transit/realtime/gtfs-realtime-service-status.proto) has the same extension code as the NYC subway (https://raw.githubusercontent.com/OneBusAway/onebusaway-gtfs-realtime-api/master/src/main/proto/com/google/transit/realtime/gtfs-realtime-NYCT.proto) extension.

I would like to use these two files together, however when I compile together I get the following error:

proto: extension number 1001 is already registered on message transit_realtime.FeedHeader

. My understanding is this would be due to the files having the same extension code, however I am new to protocol buffers so I feel I may be missing something. Any suggestions?

Thanks,

Luca